I just replaced the battery in one of these ZTE z981. First time. Very easy if you follow part of this guide. No need to remove the logic board and all the connectors. Some people are fine with prying the battery out without adding heat. I find its much easier to add heat, I used a blow dryer and a guitar pick to pop it out. A flat head screw driver worked well too, BUT BE CAREFUL when prying the battery, there are 2 ribbon cables under it that could easily be punctured. They are glued in place and flush with the plastic but, ya, be careful. Patience is key! Good luck!