Sorry, thought of one other thing:
I don't care how many videos you've seen or RC hobby friends, NEVER EVER SOLDER TO THE CELLS.
Any cell manufacturer will tell you this is insanely dangerous. The internal structures aren't capable of taking the heat, and you will damage them. The damage may or may not result in an immediate explosion, or loss of capacity, but it is there.
Battery cells can be safely welded, because although the welding temperatures are higher, the total heat delivered to the cell is much lower and the temperature rise inside the cell during a weld is tiny. Most shops like batteries plus will weld cells for you for a small fee. They weld on tabs that you can safely solder to.
I don't care how many videos you've seen or RC hobby friends, NEVER EVER SOLDER TO THE CELLS.
Any cell manufacturer will tell you this is insanely dangerous. The internal structures aren't capable of taking the heat, and you will damage them. The damage may or may not result in an immediate explosion, or loss of capacity, but it is there.
Battery cells can be safely welded, because although the welding temperatures are higher, the total heat delivered to the cell is much lower and the temperature rise inside the cell during a weld is tiny. Most shops like batteries plus will weld cells for you for a small fee. They weld on tabs that you can safely solder to.