Well I see some of you do not believe there exits a "Smart" charger.
By Smart I mean it monitors the charge and teh battery and when the preset voltage is reached it switches from BULK to absorption of float.
For example my Progressive Industries 9180 With Charge Wizard.. It is the kind of charger I can leave plugged in an hooked up for years on end if I wish. and have.
The Deltran I use as back up is half smart. it knows when to Shut down but unlike the Charge Wizard it has to be kicked back to BULK manually