Hi. To make your tablet battery last longer so you can work for a long time is very essential, the are lots of unnecessary battery wastage by unnecessary application. Some people end up downloading battery saving applications trying to extend their tablet battery life but to find the the applications makes the situation worse because it also uses battery to perform all the activities. There lot of things you can do to extend your tablet battery life.
You need to close all applications thoroughly after using them, don't just tap the home button and when the apps disappears then you think the applications are close, they are just minimized and they are still fully running in the background memory of the phone. To close an application you need to use the exit button on the app or the back button of you tablet. If you don't close your application thoroughly you find that you are running more than ten application on your table but you are only aware of one, this consumes your tablet battery ten time the normal consumption.
Another thing is to lower you network connection from 4g, LTE or 3G to 2g until the time you really need a faster internet connection. To use WhatsApp for texting you don't need the LTE connection, you can use LTE when you are sending videos or makin a video calling. Reduce brightness of the screen when you are indoors, you can set your screen brightness to auto if you don't want to keep reducing and increasing the LCD brightness every now and then. The LCD brightness consumes 80% of you fully charged battery as it is always on when ever you use your phone.