You can do it if you are real confident with your soldering abilities. The tabs in Lipos are aluminum. Some have nickle spots attached to the aluminum, some don't. If they do, you can solder to them, if they don't, you need special aluminum solder. Also, you can't get the tab too hot or it will melt the seal where the tab goes through the pouch, ruining the cell.
Since your cells have already been made into packs, you may be able to splice onto the wires that have already been attached to the lipo's tabs, using regular solder. You need to use a heat sink to insure you don't melt the aluminum solder attaching the wire to the tab.
So it can be done, but unless you are prepared to scrap the entire lot if you fail, I'd just buy pre-assembled packs.
Since your cells have already been made into packs, you may be able to splice onto the wires that have already been attached to the lipo's tabs, using regular solder. You need to use a heat sink to insure you don't melt the aluminum solder attaching the wire to the tab.
So it can be done, but unless you are prepared to scrap the entire lot if you fail, I'd just buy pre-assembled packs.
