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Is it possible? Or the device needs at least a kernel to be able to charge? I have a device in bootloop that every 3 seconds it vibrates and I'm not sure if its does not charge because I erased boot and system partitions or because its consume power everytime it vibrates preventing to charge enough for me be able to turn on fastboot mode and fix it.

Carlos Henrique
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  • I don't think it's possible. This may be relevant https://android.stackexchange.com/questions/145263/where-are-the-battery-capacity-files-located?r=SearchResults&s=1|105.2026 – beeshyams Nov 24 '21 at 14:41
  • In other words, the presence of battery, it's capacity, is current voltage levels etc are communicated by system and if that's missing, will it charge? I don't think it will – beeshyams Nov 24 '21 at 15:34
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    It's very hardware-specific question, so cannot be answered with surety. It depends on your OEM's choice of SoC/PMIC and bootloader (the components which load before the actual OS). But it's definitely possible. U-Boot is a commonly used open-source bootloader, and it does have a pretty thorough support for battery charging, without relying on Linux/Android kernel. – Irfan Latif Nov 24 '21 at 17:25
  • my device's current bootloader is lk(little kernel), I can boot in lk and choose the boot mode (normal, recovery or fastboot) but when I select anyone it shutdown, I tried let it charging while in lk but it just charge for less than 2 minutes and then shutdown, idk if lk have some kind of timeout of inactivity and shudown when its reach this timeout or its just do not support charge :/ – Carlos Henrique Nov 24 '21 at 17:45

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Assuming you already know what TWRP is, you should just install and boot into it and charge. However in your case you cant install it i guess. So best way is to plug into pc and fastboot mode the device. This will supply it with some power at least and try flashing twrp to it using adb/fastboot services. Then you can boot into twrp and charge the device from there. And if in future you're ever going to touch a phone's system/other important partitions..make sure to install twrp beforehand.

NiMBuWaLLa
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