is it me or when i use my nexus 5 and charge it, the charger doesn't have enough power to run my apps and charge, i need to turn my screen off and let it charge :'(
so it was at 90% and 10minutes after of playing on phone it goes to 89%
Depends on what you are playing and what else is running at the same time. But it can happen. similar to if I plug in while using Google maps it just slows down the battery drain. Have had the same thing happen on other devices.
Let the device fully charge then go to almost 0 and post a screen shot of the battery usage screen. It really depends on what you are using the device for and if the services are battery intensive, such as games.