Battery - how small can you safely go?

I know some of you want to save weight or go small?
But for me it's old school...Bigger is better as long as it fits! (ad funny comments here) I don't track my Car so I don't care about a little extra weight! I got my Battery a Costco about $75+tax...1000ca, over kill? 3 year full replacement, 8 year prorated. When I bought my Car it had this new Costco Battery, after a little over 9 years I chickened out and bought the same one again! Never been stranded because of the Battery!

Works for me!

I ran the Optima for years without problem. But like Cuvee, I buy from my local NAPA where I know they counter guys. They replace my battery under warrenty without question. I would go local/ good warrenty. Bill 1362

i wouldn't bother battery weight on a street car...at least not in the first place before replacing all kind of stuff with aluminium and carbon .... i have a light weight in my Porsche 928 but this is a track car on which everything is checked/changed on weight ... you can start cold with a extern battery and the light weight is only for a few starts/ emergency start... on a circuit. On the street you have no help on every corner... those modern light weights have enough amps to start but no much amps/hour... so i'm afraid flooding the engine and you need to cranck a little time could already cause a flat...also on a moment you need voltage from the battery for ignition... the alternator isn't helping yet. I had all kind of brands over the years in my cars , one has to be lucky that it is not a "monday" made battery Myself had a bad experience with a ( expensive ) Optima, best experiences and now using are Bosch closed cells. But then again, it depends also on daily- 2 times a year ? use, equipment for charging etc...

I have been running an Odyssey dry cell PC925 for many years now. I am very happy with it and would never go back to a lead acid battery because I like the weight saving, approx half. My engine always starts immediately, hot or cold, if it didn't, it may be a different story. I would say the PC925 is only just big enough. If you're intending to run one of these battery's an 100 amp (minimum) alternator is essential to keep the fans up to speed in traffic.

http://www.odysseybatteries.com/battery/pc925.htm

Johnny

I run a Braille No-Weight B2015, it is 15lbs... starts the car every time, hot/cold. I figure I saved roughly 25-30lbs. Remember it all adds up, and does make a difference, if you choose to drive the car in a more spirited manner, regardless of road or track.
Cheers JC71

The old huge Dodge battery in mine... works great and cranks forever but I don't track or race my car and with Florida heat I need all the help I can get.

Kristian,
Odyssey PC925 or equivalent Braille.
These are AGM type and have the highest power density.
The one in the image has been in service since 2003 and has been discharged yearly as it tests new products.

I agree, Odyssey is in my black car and it fires easily (however I have a cutoff switch so it doesn't drain). I think the procedure on those where the charge drops to restore it is quite a deal. Cant beat that battery in my opinion especially if doing a lowered battery box.

Thank you all for your feedback - the Odyssey PC925 it will be then.

is there a link to the install of the cutoff switches? Which one are you guys using?

Many more important than weight reduction is dropping whatever battery down under the front trunk floor ala the post-'80s Panteras. No need for a battery box- a crossmember between the front lower frame rails braces the suspension and supports the battery. With a little pulling, stock cables fit down under the floor and it allows carrying a little more 'vital debris' on road trips! Of course, icing on the cake is dropping a lightweight battery... I use a 625-amp MR-2 battery from Costco: 22 lbs. Starts our hot-rod engine first turn every time.

I've got an Optima red top "down in the hole". I think it is a 22 but would have to look to be sure.

834 cranking amps.

Works well but having said that the Optima is not what it was when it was made in the US. Mine is marked made in Mexico and between my 8 cars have killed three within the last couple of years.

Just lowered battery, very easy to do with little bracket from vender . When looking for new battery at beloved auto zone the sales man told me there where a lot of problems with the odyssey battery . So I when with there battery. It has a free 3 year replacement for 99.00 saved 70.00 sounds like I made a good decision.

Batteries never were high quality items from the manufacturer. There has to be a 50% failure rate on them. At least with the dry cells, there is no acid to worry about?

Some Update on a old post.

Are there anybody who knows something about
DYNA-BATT dry cell batteries?

I am planing to put the batteri Down between the frame under the trunk, for getting more space in the trunk

Kjeld

I win ... I have the smallest one!

I run 2 motorcycle Odesey batteries in the MGB:



For disconnect in the Pantera I have a relay for turning power on/off: