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Which Optima battery for 2002 911/ 996 ?


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After trying all sorts of things to figure out why my battery wont re charge all that well (I put a new voltage regulator in the alternator, and had it bench tested) checked all connections , did voltage checks etc ??? Anyhow, one member here suggested although the battery tested ok as well, it just could be a tired weak battery. Therefore I'm going to get a Optima one with at least 900 CCA/ cranking amps, perhaps 1000 would be better ? Anyone know the model/part # that would fit , and is recommended ? I sure hope this helps, as with lights and a/c running it barley gets over 13.2 volts at 3000 rpm, and I would like to see a steady 13.8 at least. I hope a new Optima will cure all the trouble I've had with this issue ? Any suggestions, on them, CCA , and one that fits ? Thanks Brit Dave.

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After trying all sorts of things to figure out why my battery wont re charge all that well (I put a new voltage regulator in the alternator, and had it bench tested) checked all connections , did voltage checks etc ??? Anyhow, one member here suggested although the battery tested ok as well, it just could be a tired weak battery. Therefore I'm going to get a Optima one with at least 900 CCA/ cranking amps, perhaps 1000 would be better ? Anyone know the model/part # that would fit , and is recommended ? I sure hope this helps, as with lights and a/c running it barley gets over 13.2 volts at 3000 rpm, and I would like to see a steady 13.8 at least. I hope a new Optima will cure all the trouble I've had with this issue ? Any suggestions, on them, CCA , and one that fits ? Thanks Brit Dave.

Did you test and/or replace the cables for the battery as you were advised to do in another post? If they are bad, which is common on the 996, no battery (even a higher CCA unit) is going to make the situation better.

That said, a 34R Optima will fit.

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Or this iis also an AGM H7 size Battery:

Duralast Platinum/Battery #H7 AGM

Price: $179.99

+Core: A "Core" is an item that has the ability to be rebuilt by the manufacturer using new replacement parts. Rebuilding these items helps to reduce product cost as well as aid in recycling efforts which helps the environment. When the old part is returned to AutoZone, we refund the core charge to you. $15.00

Edited by fpb111
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The manager at an Autozone told me the Duralast AGM was basically the same as the Optima... haven't had time to validate that, YMMV. Maybe he was just talking about the glass mat portion.

They are not the same; Optima has a patent on the spiral wound cell design (AKA the "six pack" shape), which is the core of its claims for superior vibration resistance and longer life expectancy.

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  • 2 months later...

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