had a try with one of these betteries

[Karl]

Hi, I splashed out and bought a Ping battery off Ebay. Ping builds them to your spec and they are Lifepo4.

Battery spec
Lifepo4
12v
40 Ah
Weight 5kg!!!!

The Results?
Well I get about thirty miles from a charge and you really notice the 10kg weight saving. I Pulled the guts out of the Oldham battery and put the new one inside so it looks original and retains key.

These new Ping batteries really are superb.They cost £350, but will outlast the life of a lead acid more than eight times over.   

A superb effort mate, and very impressive.

I've always fancied a dabble with lithium based batteries but never had the spare cash to justify it.

It's good to see them actually being used, rather than just in theory  Are they more fragile regards charging ?

[alexbromo]

A cluster of four of these Foxx 3.2v cells: http://cgi.ebay.it/Foxx-Power-LiFePo4-40a-Cell-/140350983908?pt=LH_DefaultDomain_0&hash=item20ad920ee4

capacity: 40Ah
weight: 6.5 Kg
price: £142

it appears a lot more attractive. 

Alex Bromo

[C5 ENTHUSIAST + RESTORER]

Hi all just found this site about the above take a look ..Chas

http://goldenmotor.com/SMF/index.php?topic=98.0

[Umpa]

The advertised weight for the battery is obviously prior to charging.It weighs significantly more when full of electricity!!!!.

lol that made me laugh

[frankev]

I use a Marine semi traction battery 105 Amps, the specs say you can empty it to 80% of its load many of times, it is about 28 kilo and so big that I sometimes hit the back of my feet against it when I try to pedal 
45 miles I already did once, no problemo. Still had 11.50 volts on the meter during the end of the ride, power on, that was about the same when I started. price about 100 pounds.
I'm going to swap it for a 80 amps version because it is about an inch shorter. And obviously shorter. 
There is a 55 amps version also that costs 55 pounds weights about 16 kilo.
Going to try that one for my second C5 that currently drives on a 80amps car battery. Car battery goes faster when its full but drops speed gradually. And they tell me that its bad to empty it more then 50%. Kills the battery.

Frank