Sounds like a slow drain dropping the battery voltage. The battery may have been damaged by the excess current during charge and as mentioned warped/cracked the plates. The drain could be the rectifier/regulator failing internally or trying to back feed the stator and frying the windings.
Motorcycle batteries should be charged at no more than 2 amps(1.25 is best) as they cannot take the amps a car battery can.
|