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Help phone restarts during a call

jaliy

Android Expert
does this happen to anyone ?
my phone was low on battery tho like less than 5% but shouldn't restart like that
 
There is a reason why software issues a warning at 15% battery level.

At lowest levels (like you mentioned 5%) the battery might not be able to provide the peak currents drawn by GSM radio, as a result the battery terminal voltage drop momentarily during such peak current requirement thus turning off or restarting the phone.
 
Only 5% capacity? Consider yourself fortunate that it still works - when discharged to that low level many li-ion cells would consider themselves completely drained, which is a "fail" condition.
 
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