Dry cell battery for 997 C4S

[dphatch]

Did a search but came up empty. Would like to know if anyone is using an Odyssey 925 or 1200 battery in their 997 and if so what has been your experience with regards to starting a hot engine and general battery life when the car is sitting idle for short periods of time, say a few days. Thanks.

Edited August 2, 2012 by dphatch

[dphatch]

No one using any kind of dry cell or AGM type battery ???????

[JFP in PA]

A lot of people use the Optima AGM battery, myself included; the Oddessy has been a bit more problematic due to low CCA output, particularly in colder weather (most of the so-called "racing bettery' manufacturers use a cobbled up cranking amp test designed to hide the battery's lower output). Some have also noted lights dimming when the audio amp kicks in, another sign of the unit's lower capacity.

Optima does not suffer from any of these draw backs.

Edited October 8, 2012 by JFP in PA

[dphatch]

A lot of people use the Optima AGM battery, myself included; the Oddessy has been a bit more problematic due to low CCA output, particularly in colder weather (most of the so-called "racing bettery' manufacturers use a cobbled up cranking amp test designed to hide the battery's lower output). Some have also noted lights dimming when the audio amp kicks in, another sign of the unit's lower capacity.

Optima does not suffer from any of these draw backs.

On their site, Optima doesn't list any batteries at all for any Porsche vehicles. What's that all about ? My understanding was that the 34R was the battery of choice for the 997.

[JFP in PA]

Most of the late model Porsches use the Red Top 34R (the R means the terminals are reversed, which is the configuration Porsche uses). Depending upon your exact model, you may also need a mounting kit which many make themselves or purchase (around $40) from aftermarket suppliers such as Yellow Dog Motorsports. We have installed many 34R's over the years, and it is a clean, long lived, and completely corrosion free set up.

[dphatch]

Thanks. Noticed on the Yellow Dog site the extended cables. While I know there isn't much extra length in either cable are the extended cables necessary ? Mounting plates appear to place the battery fully to the drivers side so am thinking the negative cable will work as is. Is the extended positive cable needed to reach the repositioned battery ?

[JFP in PA]

Thanks. Noticed on the Yellow Dog site the extended cables. While I know there isn't much extra length in either cable are the extended cables necessary ? Mounting plates appear to place the battery fully to the drivers side so am thinking the negative cable will work as is. Is the extended positive cable needed to reach the repositioned battery ?

At some point, the accountants at Porsche noticed that they were "giving away" an extra couple of inches of the + battery cable, and ordered them shortened immediately, making the switch to an Optima require a longer (about 2-3 inches) cable. Yours is probably one of them. You can get the longer cable from either Yellow Dog, or your local parts store, they are a stocking item.

Edited October 21, 2012 by JFP in PA