I did try to study batteries builders, but even with my mechanical incline >>>> it is a swamp there.
About 15 years I had bus conversion, who needed 4 batteries house bank.
I bought 4 golf cart batteries at Sam's for $46/piece and those batteries served me for 12 years, even most of winter season they spend in storage yard with 8 or more months without charging. I just pulled clamps from them to eliminate all the draw cable leaks can make.
Those batteries would give me power for making 1l of coffee every morning, running lights and water pump for at least 3 days before I had to recharge them.
Having 24V system, I also made some successful tries to use them for welding.
