I got hold of a leisure battery off eBay for £55. It's 85ah and does ok for a few days racing. Iwas using the car battery but 4 charges a time have been taking it's toll on the battery and I'd rather extend the life of it by not hitting it every week.
If you have a charger than you can set the max on the lipo's so 2nd time around they don't max out it may help your car battery. It is usually the last 5% that takes the longest particularly if you are balance charging as well.
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