Problem with my xiaomi mi10 5g random reboot low battery

[almog250]

I have xiaomi mi10 5g global version. I installed the last stable indian rom miui 14.0.6 to get the dual sim but my phone keeps restarting on low percentage of battery why is that? Please I don't know what to do. I flash it and my bootloader locked because I need google payment.
The problem start around 20-15 precent battery, thank you for helping

 

[zmylna]

I had the same problem.
A SECOND battery replacement helped.
The first battery I replaced turned out to be defective.
I bought another battery, replaced it and it is ok