Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

Hey Guys!!! I have a question on the battery, Why does it have to be so huge? Will fitting a small gel cel battery be ok?

Share this post


Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

997 and others use power when not in use (parked), the standard battery is just sufficient for daily driving. Small gel cell batteries are better suited for track cars.

Share this post


Link to post
Share on other sites

Hey Guys!!! I have a question on the battery, Why does it have to be so huge? Will fitting a small gel cel battery be ok?

I have replaced the battery in all four of my current P-cars and have gone with regular (much smaller and lighter) aftermarket batteries with no issues. I would recommend a trickle charger (battery maintainer) if you are going to leave them sitting for a while. Will also offer that even in the scenario of sitting for a while, the aftermarket batteries hold up a LOT better than the OEM Porsche batteries. I thought it was comical that on my 997 Turbo there was a lot of information about Porsche making the car lighter by using aluminum door skins and bonnet . I let it sit for over a week in the winter and the OEM went dead! Dealer says it happens all the time in their showroom.....So I went to pull it out and I swear it felt like it weighed 80 lbs and was about 2 feet long ! :) I saved more weight by using a regular battery..

Good luck!

DC

Share this post


Link to post
Share on other sites

Hey Guys!!! I have a question on the battery, Why does it have to be so huge? Will fitting a small gel cel battery be ok?

I just replaced my original Porsche battery with an Optima 34R red top and saved around 7 pounds (I'm not home, but did weigh both and will report back on the weight difference). The Optima is a bit smaller than the OEM. As long as you have enough power to regularly start your car, you don't need a battery so big it will continuously crank the starter in sub-zero conditions (which doesn't look like a problem for your location)

Depending on how much smaller you go with a replacement battery, you may need some kind of mounting adapter and/or a longer negative cable.

See this topic for pictures of my install. And yes, a battery maintainer is a good idea if you have a smaller battery as the cars do use battery power when just sitting parked

Share this post


Link to post
Share on other sites

My car is a daily driver. No problems with sub zero temps here in the Philippines! Nice install pics!!! THANKS!!! :thankyou:

Share this post


Link to post
Share on other sites

We have had several customers "experiment" with light weight and gel cell racing batteries in street cars, to date, none have been particularly successful. Common problems include dimming/ignition issues with bi-xenon/lits, stero issues, and brutally hard starting issues at even mildly cool weather. Problem is that small, light weight batteries are short on total cranking current (amps) and have significantly lower current reserves to properly operate the car systems. Think of the battery as a type of gas tank, small and light help handling, but brings other drawbacks. Leave the small gel cells for the race track and buy a decent properly sized battery, you will be much better off in the long run.

The Optima 34R is a good choice, a bit lighter without sacrificing capacity, and as it is a sealed AGM design, it will live about twice as long on average, and there will never be any chance of corrosion in the battery tray area. Only downsides are it costs a bit more, and require fabricating mounting plate, or buying a commercial kit from someone like Yellow Dog Motorsports. I have four Optima's in my personal cars, one over ten years old, and dozens of customers running them as well, with absolutely no issues……

Share this post


Link to post
Share on other sites

Thanks JFP! I had a sealed odysee battery in my '08 STi. It was really small to fit around the intercooler piping for the front mount intercooler. Had no issues and at full load gave out 13.7 volts. It was very light as well. I was never a fan of large batteries and thought I could put a smaller unit in the Porsche. I asked the local dealer here in the Philippines and their reply did not make much sense. Anyway, your suggestion sounds good. I just need to find the local distributor of the optima here in my neck of the woods...

Share this post


Link to post
Share on other sites

I'm not sure about the Phillipines, but any Interstate distributor in the US can get you an Optima. I've seen them on Amazon as well (buy through renntech Amazon store)

Share this post


Link to post
Share on other sites

I'm not sure about the Phillipines, but any Interstate distributor in the US can get you an Optima. I've seen them on Amazon as well (buy through renntech Amazon store)

Is there a site I can go to to check out the battery sizes???

Share this post


Link to post
Share on other sites

My original Moll battery weighed 47.2 lbs, my new Optima 34R weighed 40.6 lbs (sorry about not weighing in KG)

Is there a site I can go to to check out the battery sizes???

Optima red top battery specs are at http://www.optimabat...edtop/specs.php Lots of web sites with battery sizes, such as http://www.rtpnet.or...a/bcigroup.html

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.