Mobile battery drains off ,even when switched off?

[AC Question]

Mobile battery drains off quickly. To check the battery, I charged it 100%, took it out of mobile and kept aside for 2 days. When checked, on installing the battery it was showing 95%. I Switched off the mobile at night , when tried to switch on next morning, it failed (battery drained completely).

SAMSUNG GLAXY GT S 7562
ANDROID 4.0.4
BASEBAND VERSIONS7562DDBNE1

 

[chanchan05]

How old is the battery? Could simply be a case of an old battery.

 

[pduffer]

Sounds like it is time to replace the battery.

 

[nahoku]

Yup, agree with both above.