Greg_L

Guys, i'm considering a lightweight battery. Has anyone got any newer info on what i found below, including fitting kits and best places to buy?

TonyTaylor - Odyssey 680MJ 6kg, £150 in 2008. Appears to be a motorcycle battery ?

SuperUser - Odyssey PC925 12kg (2012) -
2002M3Drew - Braille 3121 (2012) currently £210 + fitting kit

SuperUser

Mine is still going strong with limited use. I did see some threads going around with people that were building their own Lithium batteries with a123 cells.

DobermanDad

I used to use a123 batteries when I had my motorcycles. They worked great. I bought mine pre-made, but from what I've heard they are easy to build.

911Jetta

technology is really coming around in this area.... if interested, you can make a pretty cool battery:
(copy and pasted from an earlier post)

Think outside of the box, think of how you can take advantage of electric vehicle technology, BUT not have to drive one?

My battery should still be good for a couple more years, but my next battery will be similar to what Steve Wong made. If it's good enough for Steve, it's more than good enough for me. Such a clever guy!

Thread from Pelican:
http://forums.pelicanparts.com/porsche-911-technical-forum/714823-who-street-legal-under-850kgs-1-875lbs-2.html

Steve says, "Want to take a lightweight battery to the next level?

Four ultra powerful A123 Systems lithium packs, originally developed for the Chevy Volt, used in the Fisker Karmas.

Total weight including case: 6.5 lbs. Power equivalent of a 60 lb lead acid battery."






A123 Systems 20Ah Prismatic Lithium in=on Cell (seen individually @ 16 sec.)
[/QUOTE]

vagluv

Any opinions on that weight being beneficial to the front end of a 911?

DobermanDad

I wouldn't even use the battery case and make it as small as possible. Then you can tuck it out of the way. Go for that naked frunk look.

I'm sure saving any weight on our piggies is good. They also last much longer than normal batteries.

PhatPhlatSix

Voltphreaks is even lighter but more expensive...

https://rennlist.com/forums/964-foru...l#post11737373

DobermanDad

Considering how long these batteries last, really makes the investment reasonable. A buddy of mine is an electrical engineer, I'm gonna see what he thinks about helping me build something.

Greg_L

Thanks for the responses folks. That voltphreaks one is amazingly light! Not sure i have time to get into building my own lithium one, think i'd prefer to buy a proven battery rather than risk it exploding on me i have little idea on this area, but i imagine they will be super popular once you can buy one off the shelf.

Might investigate the 680MJ for now as it seems the best price/kg

jevvy964

I've been running a PC680 since about 2008, as long as you dont let them go flat too many times they seem to de quite well. I've only just recently replaced the 2008 battery with a new one. Bought from here:

https://www.merlinmotorsport.co.uk/p...y-pc680-ody-25

A guy on IB is just trying out an alternative which is half the price:
http://www.impactbumpers.com/forum/i...ry-for-the-32/

964TT

Thats my Voltphreaks. Works great and has some electronic gadgets to protect it.
So far so good, been running it for a couple months.

Greg_L

This sounds perfect - how did you mount it ? Any chance of some pics of your bracketry etc ?

Yuasa make good batteries, so this is interesting too. Depending on the amount of effort to make a bracket for the PC680, this could be an option too. Thanks for the info.

Greg_L

2.2kgs is amazing, but £500+ is more than i want to spend on a battery.

Undutched

Gosh darn. I wrote a nice post and I got logged out!

Anyhow, a friend of mine recently opened a company and makes batteries in carbon fiber casing, which weigh a lot less than the voltphreaks and other options and is actually cheaper. Testing was completed just this year.

as you can see: 1.18kg or 2.5lbs vs. the voltphreaks 5.25lbs for the 22.5Ah version.




If anyone is interested let me know and I'll ask him.

Link to shop smaller battery
https://www.liteblox.de/produkt/liteblox-1180/

NoSub Dan

I just had a battery installed yesterday at Advance. The kid put it in backwards and fried my radio.