I brought a Samsung galaxy note 10.1 tablet about 2/3 weeks ago, everything is perfectly fine, but I realised my battery runs out extremely quick. I always close applications but it still runs out quick, I clicked settings then applications then I scrolled over to running, it shows about 7 applications running, when I click any it has a button saying force stop or something. Im not sure about it, can you help me please. it also takes a long time to charge