ORIGINAL: psuguru
You really don't want to be trickle charging at above 70mA, once the battery is fully charged.
Lead acid batteries are finnicky animals. A good start would be to ask the supplier for charging recommendations.
Cyclic charging requires different characteristics in the charger to float (or trickle) charging for the best and most efficient battery charge and life-time.
There are motorcycle chargers that would do a really good job on any small battery; 'trouble is they are about $60.
Instructions are to charge with 12V 500mA charger for 10 hours.
I'm thinking I could use the .3 amp wallwart I have and charge for 13-14 hours????
I'm thinking: .5 amps = 10 hours so .25 amps would be 15 hours so the the .3 amp I have would be about 13 - 14 hours.
what I need to know is at what voltage should I stop charging this 12 volt battery?
Just trying to get the best life without buying another charger?
steve