Xt1040 discharging waaaay too fast

Hi all :>, my GF have a moto G 1st gen LTE( xt1040) that i recently wiped and etc,stock rom, some bloatwares removed for better performance and battery time, but there is a problem with its battery, it just discharges too fast, and sometimes it even shutdown with like 70% battery, and when it reboots, has 0% battery. I was using him nicely about 1,5 or 2 weeks, but 2 days ago, it started to do this.
I'll try to calibrate the battery, and if no sucess i will reinstall the rom, any of you guys know some good way to calibrate the battery that has worked with moto G's?
If yes, please share :good: :good:
Thanks :highfive: