I own a samsung galaxy on 5 .i bought it just 4 months back.it has a 2600 mah li ion battery .1.5 gb ram,5 inch display,exynos processor.one day i kept it after locking .morning i was shocked to see my phone had lost 20% charge . I tried several apps all were a waste of time.earlier my phone lost only 3-4% overnight .pls i need help to solve this battery issue.