Just a thought but if money is tight head to a wreckers and buy a van battery. With recycling rules etc the batteries have to be drop tested to see if they're in good enough condition to be resold. I bought one for £10; we used it over a winter season of outdoor racing to run 2 chargers doing a few lipos each, putting it (the 12v) on a peak charger when we got home. Still use it now when we don't have access to mains power. I must say £39 is a bargain for a proper leisure battery, but likewise a tenner is a good option for those strapped for cash even if it only does a season.
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