I hate soldering irons.
A bagillion swear words and two hours later, I managed to get the ground lead soldered onto the pcb. I think I needed to have five sets of hands. Unfortunately, I couldn't get the hot lead (red wire) to solder on and I think I fried the circuit board.
One mistake was that I did not completely disassemble the tank, so I was working in a cramped, tiny chassis. I was constantly hitting and subsequently melting various areas of the chassis.
If anyone has any better suggestions on replacing the internal batteries of the Combat Digi Q tanks, I'm all ears.
From now on, I'm thinking of just cutting the leads to the bad battery and splicing on the leads from the replacement.
zeit-geist