adrianh, he has a Turnigy professional Lipo charger, that take care of all the aspects and balancing of said batteries. The charger is not the problem. He has spend the money on that and got the best, because of the dangers you mentioned. He is in electric RC for 5 years already and knows the stuff. The problem is the power supply to power the charger. He is using a PC power supply at the moment, but it does not deliver sufficient power. He is playing with linking two PSU's now, in series, the get more volts/amps to the charger. I understand this is very dangerous however. He has cut the earth wires to make it work. It sound like he just popped the one psu!

When he use the one only PC psu, it takes 45 min to charge 1 battery. With the two in series, it takes 25 min. The time to charge is therefore the problem. He has 4 batteries to charge, for two flights of about 5 min each.

The best solution would be to just go buy a big ass power supply, but funds is a problem.

The charger and batteries can handle 200 watt. The psu delivers 200 watt, but the voltage drops to 11 v, causing the charger to draw more amps at 11v, generating excessive heat. At 17v the charger would be pulling considerably less amps to get 200 watt.