fix: Eliminate Float? boxing from battery display and cache merge

Two SIGSEGV native crashes recurred on Android 10 in 5.1.4-rc0 inside JIT-cached code at toBatteryFloat+4 (popup) and mergeBatterySlot+40 (cache merge). Both functions had a boxed Float? unbox at function entry that R8 horizontally merged into stdlib host classes, where Android 10 ART JIT miscompiled the unbox.

Convert PodDevice battery getters to non-null Float with BATTERY_UNKNOWN sentinel and propagate primitive Float through every display/persistence consumer. mergeBatterySlot now takes primitive Float; toBatteryFloat and toBatteryOrNull are deleted. Add isKnownBattery and batteryProgress helpers used everywhere instead of scattered nullable checks. Raw live extraction in toCachedState avoids touching the unified getter so cached values aren't refreshed as live.

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),

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

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),

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

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 "—"

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?,

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,

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

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 {

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
 
 }

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

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,

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

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(