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SAJC
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Dear All

Happy New year to All

On the subject of batteries, my Banner "Starting Bull" 12v 30ah battery has decided to give up the ghost, after 5/6 years and was wondering what recommendations you would have for a replacement. My 7 is a Super 7 K series 1600.

Would welcome your suggestions and recommendation, and any website to buy from.

Thank you

SAJC (Simon)

Jonathan Kay
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Have you already decided that you definitely want a lithium battery?

How is the 7 stored: on a charger, immobilised, battery isolated, long periods? See discussion of energy capacity above.

Everything from the archives.

Happy New Year

Jonathan

SAJC
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Hi Jonathan - thanks for your prompt reply, my 7 battery is isolated, discounted and yes for long periods , but this is the first time , battery was charged before and started, this time battery charged and it didn't start, as it just died when turned the ignition over.

Simon

 

Jonathan Kay
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I wouldn't be optimistic but is it the sort that can be topped-up, and do you have a multimeter?

And if it is shot... Have you already decided that you definitely want a lithium battery? I've just updated my recommendation for non-lithium types.

Jonathan

rj
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I've got a cheap-ish Li Ion in my car. My master swich is a Brise relay and if I forget it on, the car won't start. Otherwise it turns so fast that I was almost scared first time I tried.

Could be this https://www.ebay.co.uk/p/Lithium-Ion-Motorcycle-Battery-for-KTM-Rc8-R-2009-and-Onwards-LIPO14B/1260147138?iid=122210984733&_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D49138%26meid%3Dbefd0220500f4d0185fde8663909706e%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D172442365296&_trksid=p2047675.c100005.m1851

It's correct that the capacity isn't huge, but as long as your alternator is up for the job it's not a problem.

My car is maninly used on track, but when it's on the road the lights are always on (Legal requirement here). I rarely use the heated windscreen/wipers as the car has an aeroscreen but on the other hand the alternator is smaller than standard so I would think you'd be OK. Of course when the alternator fails (not if, they do!) then you are worse off with a 6Ah battery than with a 30Ah though they have the same cranking capability.

tbirds search:

Blatchat Google Search

Mucus72
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The Magneti Marelli MM-ION-15 is rated at 32 Ah and 540 A cranking.
The Varley Lithium Li5 is rated at 5.5 Ah and 335 A cranking.

But the Varley Li5 Simon Rogers recommends on his Meteor Motorsport site is apparently suitable for Caterhams running Duratecs. 

The 3rd dimension here is weight.  
 

Daniel French i: http://www.caterhamr500.co.uk/2016/11/15kg-10ah-lifepo4-battery-inc-carbon.html

He provides 2 option suggestions, a 7.5Ah battery for lower powered cars and a 10Ah one for high end Duratecs.

This weigh in at 1.2Kg and 1.5KG respectively.

In summary:

Varley - 1.1 kg 5Ah

Magenti - 2kg 32Ah

DF option 1: 1.2kg 7.5Ah

DF option 2: 1.5kg 10Ah

What I am looking for is the lightest battery that will work for track days and the odd weekend away blatting, which will start a max of 5 times a day. A few cranks to warm things up (or the headlights on for a few secodns first) doesnt bother me.

I just don't know now if the 5Ah Varley is too low a capacity?

Simon.Rogers
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If the Varley Li5 can start my Busa as it does then it can start a Duratec.

My Busa is very high compression.

www.meteormotorsport.com
Jonathan Kay
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What I am looking for is the lightest battery that will work for track days and the odd weekend away blatting, which will start a max of 5 times a day.

Will the battery live on a charger when the 7 isn't being used? Is the current drain low when it isn't being used and not on the charger? Does the 7 start well?

If all of those are the case the energy storage might not be too important... 

Jonathan

Simon.Rogers
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The Li5 lives on a small 2A trickle charger built for the sole purpose of keeping a lithium topped up.

It will not over charge.  And only charges when the battery requires it.

www.meteormotorsport.com
Mucus72
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Thanks Simon, I’ll buy one from you before the track day season starts...