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Optima Charging problems

1997 6
Has anyone had trouble charging an optima blue top? I went to the website and it basically said that if the battery has been deeply need to wire an automotive battery parallel and charge it this way until it is above 10 amps. Has anyone tried this? I just bought a new battery marine 20...and hooked it up and left it on the charger for about 6 hours and it is not fully charged...considering the auto battery thing...any advice is appreciated. :'(
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1,580 Posts
The recommendation to connect it to another battery is only for when it is completely discharged. In that state, a lot of the new smart chargers will not recognize a battery connected and won't turn on. Thus the need for another battery to trick the charger. But if your battery has sat in that completely discharged state long, it's probably already garbage.

<Have not had good experiences with optimas in boats myself>
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