Why doea my battery drop f4om 40 to 0 instantly

Hi, I recently changed the display and battery of a Samsung J7 Prime (SM-G610M), and I'm having problems with the battery, the phone dies at around 40% battery, and it dies it doesn't begin the shut down procedure. I tried recalibrating the battery with full charge, full drain, try to turn on, and full charge. This cycle 3 times, and it still does the same.

While I could go to the old battery I'm afraid to do so, as this phone model you need to take out the display to get to the battery, and I'm afraid of breaking it.

I even tried an app for battery calibration (thou the cel is not rooted), and it marked 4.2v at full charge.

It could be a bad battery.

Battery might not be the issue after all because i changed to a new one..bur same issue...what is d problem

What phone and how old is it?

Is it always going 40 to zero, or does it happen at different levels. I.e. 20%, 33%, 15%, etc.

Does it seem dependent on your activity? I.e. Shutting off at 40% if gaming, but 20% if just browsing the net.

When this happens and you plug it back in, what does it show the battery level at?

Does it take longer to charge or drain quicker than you think it did when the phone was new?

You'll need to create an account to reply and answer the questions, but it'll help us help you. It could be that the new battery is also bad, a short circuit in the phone, or even a bug in the OS. Without knowing more specifics, it'll be impossible to make an accurate guess to solve your problem.

Threads merged. I don't know whether both are from the same poster, but it seems to me likely. In that case, register and continue posting in the original thread. https://forums.androidcentral.com/sh...d.php?t=409154

It sounds like a dendrite (Lithium Battery Dendrite links if you're interested) in the battery, The battery will have to be replaced.

Mine is a samsung J72015 model..ive even got a new battery but this problem still occurs..do u think a hard reset wud work for this???

Does it happen in Safe Mode as well? https://support.t-mobile.com/docs/DOC-30290