diff --git a/app/src/main/java/eu/darken/capod/main/ui/overview/cards/DualPodsCard.kt b/app/src/main/java/eu/darken/capod/main/ui/overview/cards/DualPodsCard.kt
index 36dedbac..df5472c6 100644
--- a/app/src/main/java/eu/darken/capod/main/ui/overview/cards/DualPodsCard.kt
+++ b/app/src/main/java/eu/darken/capod/main/ui/overview/cards/DualPodsCard.kt
@@ -67,8 +67,6 @@ import eu.darken.capod.pods.core.apple.ble.devices.DualApplePods
 import eu.darken.capod.pods.core.apple.ble.devices.DualApplePods.LidState
 import eu.darken.capod.pods.core.apple.ble.devices.HasPodStyle
 import eu.darken.capod.pods.core.apple.ble.formatBatteryPercent
-import eu.darken.capod.pods.core.apple.ble.toBatteryFloat
-import eu.darken.capod.pods.core.apple.ble.toBatteryOrNull
 import java.time.Instant
 
 @Composable
@@ -227,7 +225,7 @@ private fun ColumnScope.DualPodsCardExpanded(
             ) {
                 PodGauge(
                     iconRes = device.leftPodIcon,
-                    batteryPercent = device.batteryLeft.toBatteryFloat(),
+                    batteryPercent = device.batteryLeft,
                     chargingState = device.leftPodChargingState
                         ?: device.isLeftPodCharging?.let { if (it) AapPodState.ChargingState.CHARGING else null },
                     isInEar = device.isLeftInEar ?: false,
@@ -239,7 +237,7 @@ private fun ColumnScope.DualPodsCardExpanded(
 
                 PodGauge(
                     iconRes = device.rightPodIcon,
-                    batteryPercent = device.batteryRight.toBatteryFloat(),
+                    batteryPercent = device.batteryRight,
                     chargingState = device.rightPodChargingState
                         ?: device.isRightPodCharging?.let { if (it) AapPodState.ChargingState.CHARGING else null },
                     isInEar = device.isRightInEar ?: false,
@@ -360,7 +358,7 @@ private fun PodGauge(
 
         // Battery percentage
         Text(
-            text = formatBatteryPercent(context, batteryPercent.toBatteryOrNull()),
+            text = formatBatteryPercent(context, batteryPercent),
             style = MaterialTheme.typography.titleMedium,
             color = if (batteryPercent >= 0f) {
                 MaterialTheme.colorScheme.onSurface
@@ -412,7 +410,7 @@ private fun CaseRow(
         )
 
         BatteryCapsule(
-            percent = device.batteryCase.toBatteryFloat(),
+            percent = device.batteryCase,
             modifier = Modifier
                 .weight(1f)
                 .height(8.dp),
diff --git a/app/src/main/java/eu/darken/capod/main/ui/overview/cards/SinglePodsCard.kt b/app/src/main/java/eu/darken/capod/main/ui/overview/cards/SinglePodsCard.kt
index d88c021f..456f2732 100644
--- a/app/src/main/java/eu/darken/capod/main/ui/overview/cards/SinglePodsCard.kt
+++ b/app/src/main/java/eu/darken/capod/main/ui/overview/cards/SinglePodsCard.kt
@@ -60,7 +60,9 @@ import eu.darken.capod.monitor.core.PodDevice
 import eu.darken.capod.monitor.core.cachedBatteryFormatted
 import eu.darken.capod.pods.core.apple.aap.AapPodState
 import eu.darken.capod.pods.core.apple.aap.protocol.AapSetting
+import eu.darken.capod.pods.core.apple.ble.batteryProgress
 import eu.darken.capod.pods.core.apple.ble.formatBatteryPercent
+import eu.darken.capod.pods.core.apple.ble.isKnownBattery
 import java.time.Instant
 
 @OptIn(ExperimentalLayoutApi::class)
@@ -192,17 +194,18 @@ private fun ColumnScope.SinglePodsCardExpanded(
 ) {
     val context = LocalContext.current
 
-    val clamped = device.batteryHeadset?.coerceIn(0f, 1f)
+    val percent = device.batteryHeadset
+    val isKnown = isKnownBattery(percent)
     val animatedProgress by animateFloatAsState(
-        targetValue = clamped ?: 0f,
+        targetValue = batteryProgress(percent),
         animationSpec = tween(600, easing = FastOutSlowInEasing),
         label = "gaugeProgress",
     )
 
     val ringColor = when {
-        clamped == null -> MaterialTheme.colorScheme.surfaceVariant
-        clamped > 0.30f -> MaterialTheme.colorScheme.primary
-        clamped >= 0.15f -> MaterialTheme.colorScheme.tertiary
+        !isKnown -> MaterialTheme.colorScheme.surfaceVariant
+        percent > 0.30f -> MaterialTheme.colorScheme.primary
+        percent >= 0.15f -> MaterialTheme.colorScheme.tertiary
         else -> MaterialTheme.colorScheme.error
     }
 
@@ -237,7 +240,7 @@ private fun ColumnScope.SinglePodsCardExpanded(
                 )
 
                 // Progress ring
-                if (clamped != null) {
+                if (isKnown) {
                     CircularProgressIndicator(
                         progress = { animatedProgress },
                         modifier = Modifier.size(88.dp),
@@ -250,9 +253,9 @@ private fun ColumnScope.SinglePodsCardExpanded(
 
                 // Battery text inside ring
                 Text(
-                    text = formatBatteryPercent(context, device.batteryHeadset),
+                    text = formatBatteryPercent(context, percent),
                     style = MaterialTheme.typography.headlineSmall,
-                    color = if (device.batteryHeadset != null) {
+                    color = if (isKnown) {
                         MaterialTheme.colorScheme.onSurface
                     } else {
                         MaterialTheme.colorScheme.onSurfaceVariant
diff --git a/app/src/main/java/eu/darken/capod/main/ui/overview/cards/components/CompactBatterySummary.kt b/app/src/main/java/eu/darken/capod/main/ui/overview/cards/components/CompactBatterySummary.kt
index 25306fc3..2d9447e8 100644
--- a/app/src/main/java/eu/darken/capod/main/ui/overview/cards/components/CompactBatterySummary.kt
+++ b/app/src/main/java/eu/darken/capod/main/ui/overview/cards/components/CompactBatterySummary.kt
@@ -33,17 +33,19 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import eu.darken.capod.R
 import eu.darken.capod.monitor.core.PodDevice
+import eu.darken.capod.pods.core.apple.ble.batteryProgress
 import eu.darken.capod.pods.core.apple.ble.formatBatteryPercent
+import eu.darken.capod.pods.core.apple.ble.isKnownBattery
 
 @Composable
 fun CompactBatterySummary(
     device: PodDevice,
     modifier: Modifier = Modifier,
 ) {
-    val hasAnyBattery = device.batteryLeft != null
-            || device.batteryRight != null
-            || device.batteryHeadset != null
-            || device.batteryCase != null
+    val hasAnyBattery = isKnownBattery(device.batteryLeft)
+            || isKnownBattery(device.batteryRight)
+            || isKnownBattery(device.batteryHeadset)
+            || isKnownBattery(device.batteryCase)
 
     Surface(
         modifier = modifier
@@ -80,7 +82,7 @@ private fun RowScope.DualPodsRow(device: PodDevice) {
         percent = device.batteryRight,
     )
 
-    if (device.hasCase && device.batteryCase != null) {
+    if (device.hasCase && isKnownBattery(device.batteryCase)) {
         Spacer(modifier = Modifier.weight(1f))
         MiniCaseCluster(device = device)
     }
@@ -93,7 +95,7 @@ private fun RowScope.SinglePodRow(device: PodDevice) {
         iconRes = null,
         percent = device.batteryHeadset,
     )
-    if (device.hasCase && device.batteryCase != null) {
+    if (device.hasCase && isKnownBattery(device.batteryCase)) {
         Spacer(modifier = Modifier.weight(1f))
         MiniCaseCluster(device = device)
     }
@@ -121,21 +123,21 @@ private fun RowScope.EmptyBatteryRow() {
 @Composable
 private fun MiniPodRing(
     iconRes: Int?,
-    percent: Float?,
+    percent: Float,
     modifier: Modifier = Modifier,
 ) {
     val context = LocalContext.current
-    val clamped = percent?.coerceIn(0f, 1f)
+    val isKnown = isKnownBattery(percent)
     val animatedProgress by animateFloatAsState(
-        targetValue = clamped ?: 0f,
+        targetValue = batteryProgress(percent),
         animationSpec = tween(600, easing = FastOutSlowInEasing),
         label = "miniGaugeProgress",
     )
 
     val ringColor = when {
-        clamped == null -> MaterialTheme.colorScheme.surfaceVariant
-        clamped > 0.30f -> MaterialTheme.colorScheme.primary
-        clamped >= 0.15f -> MaterialTheme.colorScheme.tertiary
+        !isKnown -> MaterialTheme.colorScheme.surfaceVariant
+        percent > 0.30f -> MaterialTheme.colorScheme.primary
+        percent >= 0.15f -> MaterialTheme.colorScheme.tertiary
         else -> MaterialTheme.colorScheme.error
     }
 
@@ -155,7 +157,7 @@ private fun MiniPodRing(
                 trackColor = MaterialTheme.colorScheme.surfaceVariant,
                 strokeCap = StrokeCap.Round,
             )
-            if (clamped != null) {
+            if (isKnown) {
                 CircularProgressIndicator(
                     progress = { animatedProgress },
                     modifier = Modifier.size(28.dp),
@@ -177,7 +179,7 @@ private fun MiniPodRing(
         Text(
             text = formatBatteryPercent(context, percent),
             style = MaterialTheme.typography.titleSmall,
-            color = if (percent != null) {
+            color = if (isKnown) {
                 MaterialTheme.colorScheme.onSurface
             } else {
                 MaterialTheme.colorScheme.onSurfaceVariant
@@ -204,7 +206,7 @@ private fun MiniCaseCluster(
         )
         Spacer(modifier = Modifier.width(6.dp))
         BatteryCapsule(
-            percent = device.batteryCase ?: -1f,
+            percent = device.batteryCase,
             modifier = Modifier
                 .width(36.dp)
                 .height(6.dp),
diff --git a/app/src/main/java/eu/darken/capod/main/ui/widget/ComposeWidgetPreview.kt b/app/src/main/java/eu/darken/capod/main/ui/widget/ComposeWidgetPreview.kt
index b471b4b4..b9e59276 100644
--- a/app/src/main/java/eu/darken/capod/main/ui/widget/ComposeWidgetPreview.kt
+++ b/app/src/main/java/eu/darken/capod/main/ui/widget/ComposeWidgetPreview.kt
@@ -31,7 +31,7 @@ import androidx.compose.ui.unit.sp
 import eu.darken.capod.R
 import eu.darken.capod.common.compose.Preview2
 import eu.darken.capod.common.compose.PreviewWrapper
-import eu.darken.capod.pods.core.apple.ble.toBatteryOrNull
+import eu.darken.capod.pods.core.apple.ble.isKnownBattery
 import kotlin.math.roundToInt
 
 @Composable
@@ -160,7 +160,7 @@ private fun SinglePodPreview(
                         colorFilter = iconTint,
                     )
                     Text(
-                        text = formatPercent(state.percent.toBatteryOrNull()),
+                        text = formatPercent(state.percent),
                         fontSize = 12.sp,
                         color = textColor,
                         modifier = Modifier.padding(horizontal = 8.dp),
@@ -311,7 +311,7 @@ private fun PodItemRow(
             colorFilter = iconTint,
         )
         Text(
-            text = formatPercent(percent.toBatteryOrNull()),
+            text = formatPercent(percent),
             fontSize = 12.sp,
             color = textColor,
             modifier = Modifier.padding(horizontal = 4.dp),
@@ -354,7 +354,7 @@ private fun TinyPodItem(
             colorFilter = iconTint,
         )
         Text(
-            text = formatPercent(percent.toBatteryOrNull()),
+            text = formatPercent(percent),
             fontSize = 12.sp,
             color = textColor,
             maxLines = 1,
@@ -382,9 +382,8 @@ private fun DeviceLabel(
     }
 }
 
-private fun formatPercent(percent: Float?): String {
-    return percent?.let { "${(it * 100).roundToInt()}%" } ?: "—"
-}
+private fun formatPercent(percent: Float): String =
+    if (isKnownBattery(percent)) "${(percent * 100).roundToInt()}%" else "—"
 
 @Preview2
 @Composable
diff --git a/app/src/main/java/eu/darken/capod/main/ui/widget/GlanceWidgetContent.kt b/app/src/main/java/eu/darken/capod/main/ui/widget/GlanceWidgetContent.kt
index c731081e..9f1e212d 100644
--- a/app/src/main/java/eu/darken/capod/main/ui/widget/GlanceWidgetContent.kt
+++ b/app/src/main/java/eu/darken/capod/main/ui/widget/GlanceWidgetContent.kt
@@ -27,7 +27,7 @@ import androidx.glance.text.TextAlign
 import androidx.glance.text.TextStyle
 import eu.darken.capod.R
 import eu.darken.capod.main.ui.MainActivity
-import eu.darken.capod.pods.core.apple.ble.toBatteryOrNull
+import eu.darken.capod.pods.core.apple.ble.isKnownBattery
 import kotlin.math.roundToInt
 
 @Composable
@@ -122,7 +122,7 @@ private fun GlanceSinglePod(
                         colorFilter = iconTint,
                     )
                     Text(
-                        text = formatGlancePercent(state.percent.toBatteryOrNull()),
+                        text = formatGlancePercent(state.percent),
                         style = textStyle,
                         modifier = GlanceModifier.padding(horizontal = 8.dp),
                     )
@@ -270,7 +270,7 @@ private fun GlancePodItem(
             colorFilter = iconTint,
         )
         Text(
-            text = formatGlancePercent(percent.toBatteryOrNull()),
+            text = formatGlancePercent(percent),
             style = textStyle,
             modifier = GlanceModifier.padding(horizontal = 4.dp),
         )
@@ -312,7 +312,7 @@ private fun GlanceTinyPodItem(
             colorFilter = iconTint,
         )
         Text(
-            text = formatGlancePercent(percent.toBatteryOrNull()),
+            text = formatGlancePercent(percent),
             style = textStyle,
             maxLines = 1,
             modifier = GlanceModifier.padding(start = 4.dp),
@@ -341,6 +341,5 @@ private fun GlanceDeviceLabel(
 
 private fun fixedColor(argb: Int): ColorProvider = ColorProvider(Color(argb))
 
-private fun formatGlancePercent(percent: Float?): String {
-    return percent?.let { "${(it * 100).roundToInt()}%" } ?: "—"
-}
+private fun formatGlancePercent(percent: Float): String =
+    if (isKnownBattery(percent)) "${(percent * 100).roundToInt()}%" else "—"
diff --git a/app/src/main/java/eu/darken/capod/main/ui/widget/WidgetDeviceKey.kt b/app/src/main/java/eu/darken/capod/main/ui/widget/WidgetDeviceKey.kt
index 59d9f626..f47d7969 100644
--- a/app/src/main/java/eu/darken/capod/main/ui/widget/WidgetDeviceKey.kt
+++ b/app/src/main/java/eu/darken/capod/main/ui/widget/WidgetDeviceKey.kt
@@ -14,10 +14,10 @@ internal data class WidgetDeviceKey(
     val profileId: String?,
     val profileLabel: String?,
     val model: PodModel,
-    val batteryLeft: Float?,
-    val batteryRight: Float?,
-    val batteryCase: Float?,
-    val batteryHeadset: Float?,
+    val batteryLeft: Float,
+    val batteryRight: Float,
+    val batteryCase: Float,
+    val batteryHeadset: Float,
     val isLeftPodCharging: Boolean?,
     val isRightPodCharging: Boolean?,
     val isCaseCharging: Boolean?,
diff --git a/app/src/main/java/eu/darken/capod/main/ui/widget/WidgetRenderStateMapper.kt b/app/src/main/java/eu/darken/capod/main/ui/widget/WidgetRenderStateMapper.kt
index 2d1f84e3..dfb9718c 100644
--- a/app/src/main/java/eu/darken/capod/main/ui/widget/WidgetRenderStateMapper.kt
+++ b/app/src/main/java/eu/darken/capod/main/ui/widget/WidgetRenderStateMapper.kt
@@ -7,7 +7,6 @@ import eu.darken.capod.R
 import eu.darken.capod.monitor.core.PodDevice
 import eu.darken.capod.pods.core.apple.PodModel
 import eu.darken.capod.pods.core.apple.ble.getBatteryDrawable
-import eu.darken.capod.pods.core.apple.ble.toBatteryFloat
 
 object WidgetRenderStateMapper {
 
@@ -43,15 +42,15 @@ object WidgetRenderStateMapper {
                 layout = layout,
                 deviceLabel = profileLabel ?: device.getLabel(context),
                 leftIcon = device.leftPodIcon,
-                leftPercent = device.batteryLeft.toBatteryFloat(),
+                leftPercent = device.batteryLeft,
                 leftCharging = device.isLeftPodCharging == true,
                 leftInEar = device.isLeftInEar == true,
                 rightIcon = device.rightPodIcon,
-                rightPercent = device.batteryRight.toBatteryFloat(),
+                rightPercent = device.batteryRight,
                 rightCharging = device.isRightPodCharging == true,
                 rightInEar = device.isRightInEar == true,
                 caseIcon = device.caseIcon,
-                casePercent = device.batteryCase.toBatteryFloat(),
+                casePercent = device.batteryCase,
                 caseCharging = device.isCaseCharging == true,
             )
 
@@ -63,7 +62,7 @@ object WidgetRenderStateMapper {
                 layout = layout,
                 deviceLabel = profileLabel ?: device.getLabel(context),
                 headsetIcon = device.iconRes,
-                percent = device.batteryHeadset.toBatteryFloat(),
+                percent = device.batteryHeadset,
                 batteryIcon = getBatteryDrawable(device.batteryHeadset),
                 charging = device.isHeadsetBeingCharged == true,
                 worn = device.isBeingWorn == true,
diff --git a/app/src/main/java/eu/darken/capod/monitor/core/PodDevice.kt b/app/src/main/java/eu/darken/capod/monitor/core/PodDevice.kt
index 6b143a8a..94c77238 100644
--- a/app/src/main/java/eu/darken/capod/monitor/core/PodDevice.kt
+++ b/app/src/main/java/eu/darken/capod/monitor/core/PodDevice.kt
@@ -10,6 +10,7 @@ import eu.darken.capod.pods.core.apple.PodModel
 import eu.darken.capod.pods.core.apple.aap.AapPodState
 import eu.darken.capod.pods.core.apple.aap.protocol.AapDeviceInfo
 import eu.darken.capod.pods.core.apple.aap.protocol.AapSetting
+import eu.darken.capod.pods.core.apple.ble.BATTERY_UNKNOWN
 import eu.darken.capod.pods.core.apple.ble.BlePodSnapshot
 import eu.darken.capod.pods.core.apple.ble.DualBlePodSnapshot
 import eu.darken.capod.pods.core.apple.ble.SingleBlePodSnapshot
@@ -138,18 +139,24 @@ data class PodDevice(
         }
     }
 
-    // Battery — AAP preferred, BLE fallback, then cached
-    val batteryLeft: Float?
-        get() = aap?.batteryLeft ?: (ble as? DualBlePodSnapshot)?.batteryLeftPodPercent ?: cached?.left?.percent
+    // Battery — AAP preferred, BLE fallback, then cached. Returns BATTERY_UNKNOWN (-1f)
+    // for unknown to keep the type primitive; this is the boundary that previously emitted
+    // Float? and triggered Android 10 ART JIT crashes via R8-merged unbox call sites.
+    val batteryLeft: Float
+        get() = aap?.batteryLeft ?: (ble as? DualBlePodSnapshot)?.batteryLeftPodPercent
+            ?: cached?.left?.percent ?: BATTERY_UNKNOWN
 
-    val batteryRight: Float?
-        get() = aap?.batteryRight ?: (ble as? DualBlePodSnapshot)?.batteryRightPodPercent ?: cached?.right?.percent
+    val batteryRight: Float
+        get() = aap?.batteryRight ?: (ble as? DualBlePodSnapshot)?.batteryRightPodPercent
+            ?: cached?.right?.percent ?: BATTERY_UNKNOWN
 
-    val batteryCase: Float?
-        get() = aap?.batteryCase ?: (ble as? HasCase)?.batteryCasePercent ?: cached?.case?.percent
+    val batteryCase: Float
+        get() = aap?.batteryCase ?: (ble as? HasCase)?.batteryCasePercent
+            ?: cached?.case?.percent ?: BATTERY_UNKNOWN
 
-    val batteryHeadset: Float?
-        get() = aap?.batteryHeadset ?: (ble as? SingleBlePodSnapshot)?.batteryHeadsetPercent ?: cached?.headset?.percent
+    val batteryHeadset: Float
+        get() = aap?.batteryHeadset ?: (ble as? SingleBlePodSnapshot)?.batteryHeadsetPercent
+            ?: cached?.headset?.percent ?: BATTERY_UNKNOWN
 
     /** True when at least one displayed battery value was filled from cache (not live). */
     val isBatteryCached: Boolean
diff --git a/app/src/main/java/eu/darken/capod/monitor/core/cache/DeviceStateCacheExtensions.kt b/app/src/main/java/eu/darken/capod/monitor/core/cache/DeviceStateCacheExtensions.kt
index 74b84e30..71112b8a 100644
--- a/app/src/main/java/eu/darken/capod/monitor/core/cache/DeviceStateCacheExtensions.kt
+++ b/app/src/main/java/eu/darken/capod/monitor/core/cache/DeviceStateCacheExtensions.kt
@@ -3,9 +3,11 @@ package eu.darken.capod.monitor.core.cache
 import eu.darken.capod.common.SystemTimeSource
 import eu.darken.capod.monitor.core.PodDevice
 import eu.darken.capod.monitor.core.cache.CachedDeviceState.CachedBatterySlot
+import eu.darken.capod.pods.core.apple.ble.BATTERY_UNKNOWN
 import eu.darken.capod.pods.core.apple.ble.DualBlePodSnapshot
 import eu.darken.capod.pods.core.apple.ble.SingleBlePodSnapshot
 import eu.darken.capod.pods.core.apple.ble.devices.HasCase
+import eu.darken.capod.pods.core.apple.ble.isKnownBattery
 import java.time.Duration
 import java.time.Instant
 
@@ -24,15 +26,17 @@ fun PodDevice.toCachedState(
     if (!isLive) return null
     val pid = profileId ?: return null
 
-    val liveLeft = aap?.batteryLeft ?: (ble as? DualBlePodSnapshot)?.batteryLeftPodPercent
-    val liveRight = aap?.batteryRight ?: (ble as? DualBlePodSnapshot)?.batteryRightPodPercent
-    val liveCase = aap?.batteryCase ?: (ble as? HasCase)?.batteryCasePercent
-    val liveHeadset = aap?.batteryHeadset ?: (ble as? SingleBlePodSnapshot)?.batteryHeadsetPercent
+    // RAW LIVE EXTRACTION — must NOT use device.batteryLeft etc. (which fall back to cache).
+    // Reading the unified getter would re-stamp stale cached readings as fresh live data.
+    val liveLeft = aap?.batteryLeft ?: (ble as? DualBlePodSnapshot)?.batteryLeftPodPercent ?: BATTERY_UNKNOWN
+    val liveRight = aap?.batteryRight ?: (ble as? DualBlePodSnapshot)?.batteryRightPodPercent ?: BATTERY_UNKNOWN
+    val liveCase = aap?.batteryCase ?: (ble as? HasCase)?.batteryCasePercent ?: BATTERY_UNKNOWN
+    val liveHeadset = aap?.batteryHeadset ?: (ble as? SingleBlePodSnapshot)?.batteryHeadsetPercent ?: BATTERY_UNKNOWN
     val liveDeviceInfo = aap?.deviceInfo
 
-    if (liveLeft == null && liveRight == null && liveCase == null && liveHeadset == null && liveDeviceInfo == null) {
-        return null
-    }
+    if (!isKnownBattery(liveLeft) && !isKnownBattery(liveRight) &&
+        !isKnownBattery(liveCase) && !isKnownBattery(liveHeadset) && liveDeviceInfo == null
+    ) return null
 
     val newState = CachedDeviceState(
         profileId = pid,
@@ -61,15 +65,14 @@ fun PodDevice.toCachedState(
 }
 
 private fun mergeBatterySlot(
-    livePercent: Float?,
+    livePercent: Float,
     existing: CachedBatterySlot?,
     now: Instant,
 ): CachedBatterySlot? {
-    val live: Float = livePercent ?: return existing
-    val current: CachedBatterySlot = existing ?: return CachedBatterySlot(live, now)
-
+    if (!isKnownBattery(livePercent)) return existing
+    val current = existing ?: return CachedBatterySlot(livePercent, now)
     val isStale = Duration.between(current.updatedAt, now).abs() > Duration.ofMinutes(1)
-    return if (current.percent == live && !isStale) current else CachedBatterySlot(live, now)
+    return if (current.percent == livePercent && !isStale) current else CachedBatterySlot(livePercent, now)
 }
 
 private fun hasStateChanged(old: CachedDeviceState, new: CachedDeviceState): Boolean {
diff --git a/app/src/main/java/eu/darken/capod/monitor/ui/MonitorNotificationViewFactory.kt b/app/src/main/java/eu/darken/capod/monitor/ui/MonitorNotificationViewFactory.kt
index 415ce0ed..c407e8ac 100644
--- a/app/src/main/java/eu/darken/capod/monitor/ui/MonitorNotificationViewFactory.kt
+++ b/app/src/main/java/eu/darken/capod/monitor/ui/MonitorNotificationViewFactory.kt
@@ -9,6 +9,7 @@ import eu.darken.capod.monitor.core.PodDevice
 import eu.darken.capod.pods.core.apple.PodModel
 import eu.darken.capod.pods.core.apple.ble.formatBatteryPercent
 import eu.darken.capod.pods.core.apple.ble.getBatteryDrawable
+import eu.darken.capod.pods.core.apple.ble.isKnownBattery
 import javax.inject.Inject
 import kotlin.math.roundToInt
 
@@ -150,9 +151,7 @@ class MonitorNotificationViewFactory @Inject constructor(
         setTextViewText(R.id.device, device.getLabel(context))
     }
 
-    private fun percentToInt(percent: Float?): Int {
-        if (percent == null) return 0
-        return (percent * 100).roundToInt().coerceIn(0, 100)
-    }
+    private fun percentToInt(percent: Float): Int =
+        if (isKnownBattery(percent)) (percent * 100).roundToInt().coerceIn(0, 100) else 0
 
 }
diff --git a/app/src/main/java/eu/darken/capod/pods/core/apple/ble/PodDeviceExtensions.kt b/app/src/main/java/eu/darken/capod/pods/core/apple/ble/PodDeviceExtensions.kt
index a119bbce..6560d5b7 100644
--- a/app/src/main/java/eu/darken/capod/pods/core/apple/ble/PodDeviceExtensions.kt
+++ b/app/src/main/java/eu/darken/capod/pods/core/apple/ble/PodDeviceExtensions.kt
@@ -21,17 +21,18 @@ import kotlin.math.roundToInt
 
 const val BATTERY_UNKNOWN = -1f
 
-fun Float?.toBatteryFloat(): Float = this ?: BATTERY_UNKNOWN
+fun isKnownBattery(percent: Float): Boolean = percent.isFinite() && percent >= 0f
 
-fun Float.toBatteryOrNull(): Float? = takeIf { it >= 0f }
+fun batteryProgress(percent: Float): Float =
+    if (isKnownBattery(percent)) percent.coerceIn(0f, 1f) else 0f
 
-fun formatBatteryPercent(context: Context, percent: Float?): String =
-    percent?.let { "${(it * 100).roundToInt()}%" }
-        ?: context.getString(R.string.general_value_not_available_label)
+fun formatBatteryPercent(context: Context, percent: Float): String =
+    if (isKnownBattery(percent)) "${(percent * 100).roundToInt()}%"
+    else context.getString(R.string.general_value_not_available_label)
 
 @DrawableRes
-fun getBatteryDrawable(percent: Float?): Int = when {
-    percent == null -> R.drawable.ic_baseline_battery_unknown_24
+fun getBatteryDrawable(percent: Float): Int = when {
+    !isKnownBattery(percent) -> R.drawable.ic_baseline_battery_unknown_24
     percent > 0.95f -> R.drawable.ic_baseline_battery_full_24
     percent > 0.80f -> R.drawable.ic_baseline_battery_6_bar_24
     percent > 0.65f -> R.drawable.ic_baseline_battery_5_bar_24
@@ -42,8 +43,8 @@ fun getBatteryDrawable(percent: Float?): Int = when {
     else -> R.drawable.ic_baseline_battery_0_bar_24
 }
 
-fun getBatteryIcon(percent: Float?): ImageVector = when {
-    percent == null -> Icons.AutoMirrored.TwoTone.BatteryUnknown
+fun getBatteryIcon(percent: Float): ImageVector = when {
+    !isKnownBattery(percent) -> Icons.AutoMirrored.TwoTone.BatteryUnknown
     percent > 0.95f -> Icons.TwoTone.BatteryFull
     percent > 0.80f -> Icons.TwoTone.Battery6Bar
     percent > 0.65f -> Icons.TwoTone.Battery5Bar
diff --git a/app/src/main/java/eu/darken/capod/reaction/ui/popup/PopUpContent.kt b/app/src/main/java/eu/darken/capod/reaction/ui/popup/PopUpContent.kt
index 46c7479d..44280c6d 100644
--- a/app/src/main/java/eu/darken/capod/reaction/ui/popup/PopUpContent.kt
+++ b/app/src/main/java/eu/darken/capod/reaction/ui/popup/PopUpContent.kt
@@ -39,8 +39,6 @@ import eu.darken.capod.monitor.core.PodDevice
 import eu.darken.capod.pods.core.apple.PodModel
 import eu.darken.capod.pods.core.apple.ble.formatBatteryPercent
 import eu.darken.capod.pods.core.apple.ble.getBatteryIcon
-import eu.darken.capod.pods.core.apple.ble.toBatteryFloat
-import eu.darken.capod.pods.core.apple.ble.toBatteryOrNull
 
 @Composable
 fun PopUpContent(
@@ -115,7 +113,7 @@ private fun DualPodContent(device: PodDevice) {
         // Left pod
         BatteryColumn(
             iconRes = device.leftPodIcon,
-            batteryPercent = device.batteryLeft.toBatteryFloat(),
+            batteryPercent = device.batteryLeft,
             isCharging = device.isLeftPodCharging ?: false,
             modifier = Modifier.weight(1f),
         )
@@ -124,7 +122,7 @@ private fun DualPodContent(device: PodDevice) {
         if (device.hasCase) {
             BatteryColumn(
                 iconRes = device.caseIcon,
-                batteryPercent = device.batteryCase.toBatteryFloat(),
+                batteryPercent = device.batteryCase,
                 isCharging = device.isCaseCharging ?: false,
                 modifier = Modifier.weight(1f),
             )
@@ -133,7 +131,7 @@ private fun DualPodContent(device: PodDevice) {
         // Right pod
         BatteryColumn(
             iconRes = device.rightPodIcon,
-            batteryPercent = device.batteryRight.toBatteryFloat(),
+            batteryPercent = device.batteryRight,
             isCharging = device.isRightPodCharging ?: false,
             modifier = Modifier.weight(1f),
         )
@@ -144,7 +142,7 @@ private fun DualPodContent(device: PodDevice) {
 private fun SinglePodContent(device: PodDevice) {
     BatteryColumn(
         iconRes = device.iconRes,
-        batteryPercent = device.batteryHeadset.toBatteryFloat(),
+        batteryPercent = device.batteryHeadset,
         isCharging = device.isHeadsetBeingCharged ?: false,
     )
 }
@@ -157,7 +155,6 @@ private fun BatteryColumn(
     modifier: Modifier = Modifier,
 ) {
     val context = LocalContext.current
-    val nullablePercent = batteryPercent.toBatteryOrNull()
 
     Column(
         modifier = modifier,
@@ -184,14 +181,14 @@ private fun BatteryColumn(
                 )
             } else {
                 Icon(
-                    imageVector = getBatteryIcon(nullablePercent),
+                    imageVector = getBatteryIcon(batteryPercent),
                     contentDescription = null,
                     modifier = Modifier.size(16.dp),
                 )
             }
             Spacer(modifier = Modifier.width(2.dp))
             Text(
-                text = formatBatteryPercent(context, nullablePercent),
+                text = formatBatteryPercent(context, batteryPercent),
                 style = MaterialTheme.typography.bodyMedium,
                 maxLines = 1,
                 overflow = TextOverflow.Ellipsis,
diff --git a/app/src/test/java/eu/darken/capod/monitor/core/PodDeviceCacheTest.kt b/app/src/test/java/eu/darken/capod/monitor/core/PodDeviceCacheTest.kt
index 15d7841c..1ed635e9 100644
--- a/app/src/test/java/eu/darken/capod/monitor/core/PodDeviceCacheTest.kt
+++ b/app/src/test/java/eu/darken/capod/monitor/core/PodDeviceCacheTest.kt
@@ -3,6 +3,7 @@ package eu.darken.capod.monitor.core
 import eu.darken.capod.monitor.core.cache.CachedDeviceState
 import eu.darken.capod.pods.core.apple.PodModel
 import eu.darken.capod.pods.core.apple.aap.AapPodState
+import eu.darken.capod.pods.core.apple.ble.BATTERY_UNKNOWN
 import eu.darken.capod.pods.core.apple.ble.devices.DualApplePods
 import io.kotest.matchers.nulls.shouldBeNull
 import io.kotest.matchers.nulls.shouldNotBeNull
@@ -57,7 +58,7 @@ class PodDeviceCacheTest : BaseTest() {
             device.batteryLeft shouldBe 0.8f
             device.batteryRight shouldBe 0.7f
             device.batteryCase shouldBe 0.5f
-            device.batteryHeadset.shouldBeNull()
+            device.batteryHeadset shouldBe BATTERY_UNKNOWN
         }
 
         @Test
diff --git a/app/src/test/java/eu/darken/capod/monitor/core/cache/ToCachedStateTest.kt b/app/src/test/java/eu/darken/capod/monitor/core/cache/ToCachedStateTest.kt
index 9886c5e0..c25d6665 100644
--- a/app/src/test/java/eu/darken/capod/monitor/core/cache/ToCachedStateTest.kt
+++ b/app/src/test/java/eu/darken/capod/monitor/core/cache/ToCachedStateTest.kt
@@ -252,6 +252,37 @@ class ToCachedStateTest : BaseTest() {
             result.rightEarbudSerial shouldBe "R-1"
             result.marketingVersion shouldBe "9999"
         }
+
+        @Test
+        fun `DeviceInfo-only update preserves existing slot timestamps (no live refresh)`() {
+            // Regression: if toCachedState consults the unified PodDevice.batteryX getter (which
+            // falls back to cache), an AAP-only DeviceInfo update would re-stamp every slot with
+            // `now`, refreshing stale cached readings indefinitely. Raw live extraction prevents
+            // that.
+            val oldStamp = now.minusSeconds(3600)
+            val existing = CachedDeviceState(
+                profileId = "test-profile",
+                model = PodModel.AIRPODS_PRO3,
+                left = CachedDeviceState.CachedBatterySlot(0.8f, oldStamp),
+                right = CachedDeviceState.CachedBatterySlot(0.7f, oldStamp),
+                case = CachedDeviceState.CachedBatterySlot(0.5f, oldStamp),
+                marketingVersion = "OLD",
+                lastSeenAt = oldStamp,
+            )
+            val device = PodDevice(
+                profileId = "test-profile",
+                ble = null,
+                aap = AapPodState(deviceInfo = deviceInfo(marketingVersion = "NEW")),
+                profileModel = PodModel.AIRPODS_PRO3,
+            )
+
+            val result = device.toCachedState(existing, now).shouldNotBeNull()
+            result.marketingVersion shouldBe "NEW"
+            result.left?.updatedAt shouldBe oldStamp
+            result.right?.updatedAt shouldBe oldStamp
+            result.case?.updatedAt shouldBe oldStamp
+            result.left?.percent shouldBe 0.8f
+        }
     }
 
     private fun deviceInfo(