At the first beginning, the battery will drain quickly,this issue is caused due to the li-ion/polymer of a new battery is unstable! It will become normal after long-term use.
if you are unable to turn your phone on after installed, please reinstall the ribbon cable, check its connector and clip it hard. Next, charge your phone for 20 minutes or longer. Then try to turn on your phone.
CAUTION: Do not open, crush, puncture. short external contacts or dispose in fire or water. Risk of fire, explosion and burn. Do not open, crush,heat.