I know that some of the 'not-so-experienced' electric users like to use their 7.xV cells as both receiver and main batteries... but because of the mechanical speed controls, you get a runaway when the battery gets low as the motor draws too much... I can solder like a king (Not), but I can solder. I was doing industrial electronics at college. I will get a pack from RC-Mushroom. Why do you mean can I solder, do you suggest making a pack? What sort of power rating do you think I could get? 1000mAh or 1100???