Building batteries like these based on LiFePO4 is very easy to do, but you have to think about safety, especially if you put a battery in a moving vehicle. If

Building batteries like these based on LiFePO4 is very easy to do, but you have to think about safety, especially if you put a battery in a moving vehicle. If something goes wrong with these kind of batteries, it's never the batteries themselves (specifically LiFePO4) but it's always a bad connection or an undersized wire causing high resistance and thus heat --> fire. In my case, my wires are quite oversized and I bought a proper lug nut crimping tool (and not use a vice or soldering (Don't do it)) to make the connections. I've also really made all connections tight, double-checking them.