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Old 06-11-2010, 07:08 AM
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Fudman Fudman is offline
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Location: Sudbury, MA
 
Join Date: Apr 2007
Posts: 6,204
Mein Auto: '02 530i Sport auto
FWIW, I do not believe you can "restore" a dead battery. I don't know the chemistry behind it but starting batteries are designed to stay at full charge to maximize lifespan. Repeated discharging of a starting battery will kill it. That is why they are not used on boats that use trolling motors, fish finders, etc. when the main motor is not running. For repeated discharging of a battery, a deep cycle battery is recommended, which can sustain repeated discharges and will recharge to it's full potential.
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