It sounds like the battery has reached its end of life. Rechargeable batters have a finite number of charge/discharge cycles in them. If it has been used for a long time, that would be my best diagnosis without looking at it.
12 posted on 05/06/2014 3:07:49 PM PDT by Fledermaus
(Conseravtives are all that's left to defend the Constitution. Dems hate it, and Repubs don't care.)