Phone shuts down even if its 90% charged

[Magicianthe1st]

Device: LG thinq v40 from T-Mobile
Android version 10

I bought a used LG thinq v40 6-7 months back, and everything worked fine until the last 2 weeks, the phone started shutdown even if it had 90% battery. Things that i did to solve the problem are deleting apps, and monitoring the battery, but I don't see any occur. Before my phone shuts down pops up empty battery and the turns off, also sometimes when I push the button to start the device, a circle with question mark blinking shows up. I want to mention the phone overheats, but not all the time periodically.
So far I believe that the battery is broken, and needs to be changed, but I would like a second opinion from you. Also what tool I can use to open the back?, looks tight and my student card want fit.

 

[B. Diddy]

Welcome to Android Central! Sounds like a failing battery. See if it still happens in Safe Mode: https://www.t-mobile.com/support/devices/android/lg-v40-thinq/safe-mode-lg-v40-thinq. You can also install Accubattery and look at the Battery Health section after a few charge cycles. Anything under 85% means the battery is pretty much shot.

 

[Chuck Finley69]

Device: LG thinq v40 from T-Mobile
Android version 10

I bought a used LG thinq v40 6-7 months back, and everything worked fine until the last 2 weeks, the phone started shutdown even if it had 90% battery. Things that i did to solve the problem are deleting apps, and monitoring the battery, but I don't see any occur. Before my phone shuts down pops up empty battery and the turns off, also sometimes when I push the button to start the device, a circle with question mark blinking shows up. I want to mention the phone overheats, but not all the time periodically.
So far I believe that the battery is broken, and needs to be changed, but I would like a second opinion from you. Also what tool I can use to open the back?, looks tight and my student card want fit.

Sounds like it’s time for a replacement battery. Make sure the device will continue to be supported by TMO VoLTE after 3G shutdown. On TMO website, there’s an IMEI checker.

 

[B. Diddy]

Was this you as well? https://forums.androidcentral.com/a...battery-percentage-go-90-0-a.html#post6966394