Thanks Cosmin. The issue we had before was that the 22AWG wires got so hot they melted their insulation before the fuse tripped! The battery has a very high discharge rate, 50-90c at 850MaH, but it could've just been poor quality wire. The main problem is really just attaching such thick wires to such small connectors, but I'll try using some high quality 20AWG we have laying around if you think that's strong enough. Plus as you say the heat in to get proper solder flow has been a right pain so hopefully thinner wire will work out