Yupp. I've seen it done before although it's really not suggested. Nothing will happen to you cells if done properly, but you always run the risk of overheating them or ruining the cells otherwise.
Four steps to make sure you follow:
1.) Have a clean soldering tip with at least 40Watts and a chisel tip if possible, makes it a ton easier.
2.) Scuff up the battery surface with course sandpaper for solder to stick to. The left over solder from the battery bars may become either weak, brittle or unable to stick to the new solder. Try to get as much off as possible when desoldering them and then scuff up the surface.
3.) Don't keep your iron on for more than 7-10 seconds. More than that you'll probably cause damage to your cells.
4.) Tin the battery bars, iron, and battery surface before you join them together. Makes the contact much easier.
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