Originally posted by mpenza
It's bad because your charger is timer-based. Everytime, you switch off the power, it will charge for 16 hours before turning green. The green color just means 16 hours, it doesn't mean anything about the charge status of the batteries.
An intelligent charger on the other hand would not have this problem. The built-in circuit will detect the level of charge and once full, charging will either stop or go to a trickle mode.