xperia z weird shutdown (help)

[hani1337]

Helllo.. i just got new 4g lte sim card and when i activate mobile data the phone lost signal and shutdown itself(even in 80%) and then it keeps rebooting... but when the charger i plugged this issue never happenes (and it happens only with lte) ... and by the way the battery suddenly drops from 70 to 14 and sometimes from 10% to 80%

 

[Zerikwan]

I'm sure it's a battery problem.
My first original battery do that too, dropped from 60% to 6% after reboot and 80% to 99% while charging.
The second replacement battery make my device suddenly turned off while it searching for a network, and a few days later it could no longer saves energy, can't be charged.