Resoldering a Lipo battery

I have a 4S lipo from Hobby King which had 2 of the charging wires break. I wasn't sure about resoldering it. Some would dump it but I prefer to get as much use out of things before I dump them. I noticed on a Hobby King forum that a guy had the same issue and did resolder the wires... so I decided to try. I carefully broke the cover for the battery. The positive and a white wire had broke (then the black broke too!). The positive was pretty obvious but the the other one I wasn't so sure about. Turns out it was one of the middle cells. The only real problem I had was the soldering iron to use. My 25W didn't really have enough power to get a good solder joint. However my 80W; the bit was too big to get near the area to solder so I had to use the 25W. Eventually I managed to get enough heat and the joints appear to be strong enough.

Just a warning though. This battery is a 4000mAH 4 cell. It packs a punch if you short circuit it. Be very careful if you do this. If you are unsure, get some help or dispose of the battery.

This is a great site for technical aspects of lipos Lipo technical details