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Edd: Do You Use a Lithium Ion Battery?

944 man

944 man

Active member
I have managed to convey the gyst of this post so eloquently in the thread title that I am only filling here... [:D]
 
Truncating all censored words down to fours asterisks makes everything look a lot worse than it really was.
 

ORIGINAL: 944 man

Bugger. Were you looking into the possibility of buying one or am I hopelessly confused?
Click to expand...

Yes, sort of, I looked at them when I had a 'how to save some weight moment'. Although expensive I worked out that it was actually cheaper than buying, fitting and painting a set of FG wings, and it saved more weight (16kg). For a race car I can see their value but Lithium batteries have their limits.

Voltphreaks seemed to have the best tech at the time, they come with a system that automatically shuts down the battery to leave enough voltage to start the engine should you leave your lights on, etc. The VPH750 was the model Voltphreaks suggested for the 944.


Edd
 
Thanks Edd: for some reason I thought that you had gone ahead and bought one. Im half looking at this range at the moment, but Im unsure as to which size to opt for.
 
I need the battery to be sufficiently 'large' to start the car, but I also want it to fit within a small battery box in the original location. I think that I will experiment with a few lead acid motorcycle batteries that I have in order to attempt to establish what I can get away with.

One small battery was enough to power my series one car, but the only electric feature on that was the blower!
 

ORIGINAL: 944 man

Im half looking at this range at the moment, but Im unsure as to which size to opt for.
Click to expand...

The largest capacity of those Furore batteries is only equivalent to the bike battery YTX20L-BS and they are only 18Ah

Is that really going to be enough capacity to start one of our big old four bangers?

Those Voltphreaks Li-ons look just the job, but will be over £600 after delivery and VAT [:eek:]
 
My early car was happy enough on a 6FM18 which is also rated at 18Ah. Someone on TIPEC has run a daily on one fo the batteries in that range too, but Im not sure which one yet.
 
I suspect that CCA is a better indicator (360a for both the Voltphreaks and the Furore), but this isnt stated on the bike batteries that I have.
 

ORIGINAL: Diver944


ORIGINAL: 944 man

Im half looking at this range at the moment, but Im unsure as to which size to opt for.
Click to expand...

The largest capacity of those Furore batteries is only equivalent to the bike battery YTX20L-BS and they are only 18Ah

Is that really going to be enough capacity to start one of our big old four bangers?

Those Voltphreaks Li-ons look just the job, but will be over £600 after delivery and VAT [:eek:]
Click to expand...
Mine will start off an old 18ah battery robbed from a fire alarm PSU, also those cheap jumpstart packs you can buy can't have much of a battery in.
 
I agree with Paul I think you would struggle with batteries that small, yes it may well start the car but would it be able to cope with a cold start, then heater on, lights, wipers, radio, etc. Even the larger one I suggested would have its limitations compared to a standard lead battery.

Also, a lithium battery CANNOT be allowed to be fully discharged as this renders them useless, hence the failsafe with the voltphreaks, if the ones you listed do not have this leaving lights on could be an expensive mistake. If I were to buy a lithium battery I would probably invest a bit more and get the latest tech and therefore best performance/longevity.


Edd
 
I use a Varley:

http://www.demon-tweeks.co.uk/motorsport/batteries/varley-red-top-35-battery

Which copes, the only thing is the terminals are really small 10mm bolts, so you cant put a big lug on the cable.

It compromises the CCA, because you end up with 110 A lugs :

http://www.demon-tweeks.co.uk/motorsport/battery-cable-connectors/auto-marine-starter-terminals

which in turn compromises the cable you can use.
 
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