Classic cars forum & vehicle restoration.

Rick · Site Admin Joined: 27 Apr 2005 Posts: 22840 Location: UK

Hi all,

I need to buy a battery for the Velo Clubman (500cc). At some point it was converted to 12v, what rating should I be looking for? Obviously there's no electric starter, just the head and tail lamps from memory, so what would be a suitable amp-hour rating to go for??

thanks, R
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Bengt Axel · Joined: 07 Sep 2008 Posts: 295 Location: Cheshire

I'll ask my dad when I see him at the weekend. His Velo Clubman has now got to the reassembly, rather than dis-assembly stage, so hopefully not long now!.

Jim.Walker · Joined: 27 Dec 2008 Posts: 1229 Location: Chesterfield

Can't answer this directly Rick. But logically, using only half as many amps to drive things, then only half the amp hours specified for the original at 6 volts.
However bearing in mind that you likely have a more powerful headlamp bulb, used more frequently with modern traffic I would settle for the same capacity as original. Especially if you intend to fit flashers for safety (I won't ride a bike these days without them - young drivers think you are waving at them!)
The modern Gel batteries are much more compact then the old lead/acids so space should not be a problem. In fact a 12volt Gel battery will comfortably fit inside a dummy 6volt case to maintain appearance. With other advantages too.
Anyway, a pint is always better than a half, isn't it? Smile

Jim.
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Bengt Axel · Joined: 07 Sep 2008 Posts: 295 Location: Cheshire

My dad was not much help to be honest - his view is simply that as long as it generates more than it uses, then you are OK (given that you haven't got a starter motor to worry about).

It is something he will have to tackle himself soon as he plans to convert his to 12v, simply to enable him to fit indicators.

Mrs Axel has a degree in Electronics, so I will ask her.

MVPeters · Joined: 28 Aug 2008 Posts: 822 Location: Northern MA, USA

Rick

I think I'd just go for the largest (&/or largest amp/hr capacity) that will fit the case. This will give you the most reserve if the dynamo croaks. A deep-cycle design wouldn't hurt, but they get expensive.
Make sure the terminals are in the right places!
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