I have a Moto Z2 Play with Android 8.0.0, about 3 years old. Whenever I go out of range of 4g (to 3g), the battery goes from 100% to 80 or 70 in a couple minutes and then to single digits very quickly and the phone shuts down. The phone will not turn back on in this state. When I charge it, it returns to 70/80 immediately and it will turn back on. This never happens in 4g.

What is the problem? Is the battery just faulty?

--- follow up ---

I attached a power bank and went out. Here is what happened.

It lasted longer, perhaps an hour and then went to single digits and then turned off. I then restarted the phone with the power bank and it was quickly back up to full power.

What does this tell us?

  • Faulty battery cannot be ruled out but the problem looks with modem or RIL. In 3G mode it draws high surge current which the battery is unable to supply. Feb 5 '20 at 1:06
  • 1
    Try to get a power bank and connect it to your phone. If the problem persists the battery is not the main problem.
    – Robert
    Feb 5 '20 at 8:44
  • See edit to question for the follow up Feb 7 '20 at 18:18
  • It tells that your phone draws abnormally high amperage. Question is more about hardware and electronics than Android. But the root cause can be a bad RIL etc. Feb 7 '20 at 18:27
  • Sounds like time for a new phone. Feb 7 '20 at 18:45

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