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So i received this from my dad, i noticed the battery started draining a lot after the first week, and i did not hit the phone or put it in sunlight. i looked online and some say it was either bad battery or software bug so i even unlocked my phone just to use another ROM, also tried different versions of the original before unlocking. and nothing changed. still drained quick.
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Hi @manyord
Chances are it's a failing battery.
Check that you haven't got the WiFi, BT and GPS permanently turned on (unless you use them a lot) as all of these use a lot of power.
If they're off and it still discharges quickly, change the battery. They're not that expensive and if it is the problem it will save a lot of wasted time looking for a software problem that isn't there.
Here's the ifixit Xiaomi Redmi Note 9S Battery Replacement guide that shows what to do.
Search online for BN55 battery to find suppliers that suit you best.
这个答案有帮助吗？
alright thanks, will look for a new battery and watch that video
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