I was experiencing short battery duration (the battery was lasting barely 1 day) on my Samsung Galaxy J3 (2016) phone running LineageOS 14.1. The battery didn’t last any longer with the original ROM, so I assumed that the battery was old and bought a new one, replacing the original 2600mAh battery with an third-party 3630mAh one. The battery duration did improve a bit, but not nearly as much as I expected it to with a new battery with larger capacity. So I decided to investigate the situation a bit better.
The webs had told that the problem was likely some application holding a wakelock, blocking the phone from sleeping. I installed an app called BetterBatteryStats, which can be found on F-Droid. This app runs in background and collects battery usage statistics from running apps; you have to let it run for a while to get useful information from it. After some 30 minutes, I looked at the Partial Wakelocks panel and saw that there was a NfcService:mRoutingWakeLock item responsible for some 22% of battery consumption.
Now, NFC is a technology used for contactless payments using the phone, and similar applications. The Galaxy J3 does not support NFC. I’m not sure why the system was wasting CPU on this; I have found other people complaining about this same issue on the same ROM and phone.
The solution is to disable NFC Service in the system. Open up adb shell
, become root (su
), and then run:
pm hide com.android.nfc
After you do this, the system will loop complaining that NFC Service has been stopped. Restart the phone, and the error will be gone.
After a full charge, the system battery stats now tell me the battery will last 4 days. Will it really? Only time will tell, but I can already see that the battery is draining much more slowly than before.
@c.m.: It did last 4 days, but rather than showing a constant rate decrease, the duration estimate updated to 6 days at some point and at the fourth day it sharply dropped. I still don't know if it's a hardware problem (the battery hasn't properly calibrated yet since it's new) or a software problem (something started eating battery like crazy at some point).
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c.m., 2021-06-06 17:19:35 +0000 #
RemindMe! 4 days