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From what I've read, it is best to recharge the battery whenever you are done using it, and try not to drain it completely. <br /><br />Here is a good link with some info you might want to check out.<br /><br /> Deep Cycle Care <br /><br />Have fun...
Boatin'B's right. Sulfidation kills lead acid batteries, and it begins when the batteries are about 40% discharged. Deep cycle batteries are just better at putting up with it.<br />No rechargable battery likes to be completely discharged, btw.
Mike<br />Only one that would suggest draining battery is someone who sell new ones. Drain a starting battery and it will be damaged, deep cycle handle it a little better but best way is to charge as soon as possible but do not over charge. Get a good AUTOMATIC battery charger.
The confusion comes as some, older recharchable batteries (Ni-Cad) work better if fully cycled.<br /><br />Never applied to automotive batteries. Charge em when you get home. I have an outlet in my box and I charge mine on the way home.