Hello all. I've been having issues with my battery for the past few weeks. When I check the battery under settings it says Screen is using the most at 27%, then Android OS at 20% and Android System at 13%. Thing is it loses between 30 and 60% charge when I sleep and will drain fast with moderate to no use, is this normal?. I have GPS off and it's almost always on wifi. It has 4.4.2 and is the N900A model. Any ideas? Thanks.