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I know that I probably shouldn't let the battery run so low on my Kindle Fire, but occasionally I have let it dip below 5%. Once this happens, the device no longer let's me trickle charge, and it powers itself down, even while plugged in.
Is there a way to override this setting? Sometimes I want to finish something up before letting it rest and charge up completely. To what extent does it damage the battery to run it so low?
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Unfortunately this is not possible. The exact explanation for this actually comes from Android. Buried deep within the Android source code is this little gem:
BatteryService.java:239
private void shutdownIfNoPowerLocked() {
if (mBatteryLevel == 0 && !isPoweredLocked(BatteryManager.BATTERY_PLUGGED_ANY)) {
[...]
This basically forces the system to shutdown if the battery level reaches 0%. The isPoweredLocked function determines whether any of the following are true:
The battery status is unknown
The device is connected to AC
The device is connected via a USB cable
The device is within range of a wireless charger
It should also be noted (as Jason mentioned in his comment) that lithium-ion batteries typically power off when they reach a predetermined low voltage to prevent further discharge and consequent damage.
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