The correct way to charge any battery is to refer to the amp/hour rating of
the battery. For instance, if the battery is a 10 amp/hour, and needs charged
you would charge it at 1 amp for 10 hours. If you had a 500 milli-amp charger
( 1/2 amp ) you could charge it for 20 hours.

Excess charging will not help the battery, it will harm it. This is where the timer
comes in handy....use it to set the charging time, and do not over charge it.

FBD.