I've read that battery calibration apps are only a placebo effect and they do nothing. Is this true? What to do if your phone suddenly shuts down at 25%?

  • Need new battery is most likely reason. – user202027 Nov 16 '18 at 16:17

Battery calibration being a myth was asked here Bought a new battery, do I need to calibrate it? - incidentally by you :-), so yes to repeat, it's a myth (see Izzy's answer that stressed this)

To address shutting down at 25%:

  • If the battery is old or heavily used I would first change the battery

  • Check if the behavior persists in safe mode. If it does go to next step. If it doesn't it's caused by some app you installed (unlikely)

  • Do . If it continues, flash stock ROM (updated if available) or custom ROM

  • If none of these help head to service center get an estimate and choose between repair or replacement of the device

  • Funny you're also in the old question :-) – IMB Nov 18 '18 at 17:05
  • Yes. I was waiting for you to say that :-) – beeshyams Nov 18 '18 at 17:09

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