I buy 12v batteries form the scrap yard ("recycling centre!") for £10 a go; last one I bought is a van battery and like new, going strong. They have to 'drop test' them (voltage I think) to make sure they're suitable for recycling, so you know you're getting a decent battery. (Ask if it's been tested to be sure.)
Leisure battery is better long term but at £10 per battery maybe try a car one first and see how long it lasts.
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