If you are going to buy new then a leisure battery designed for camping/marine use is ideal as they are designed for a longer discharge cycle that we put them under whilst charging. Look around and you can generally get a 100ah one for £50-60 quite easily. Camping shops are sometimes good and occasionally even Halfords have some good deals. I seem to remember I got my last one on-line somewhere with free postage which seemed good as the thing weighed a bit! You will need a proper charger for one of these - don't use a normal 12V car battery charger as you will kill it fairly quickly, (£10 from ebay) otherwise you should get a few years out of it.
However if you can get hold of a very cheap/free 12V car/van battery that someone is trying to get rid off then that can be a good cheap shorter term option.
Rob
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Rob Warren
Yokomo Cal3.1
Yokomo YZ4 SF2
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