[BrianG]

With 10 cells, you have a lot of options. If you want 3s1p, you could make three seperate 3s packs with one cell left over. If you want better runtime, you could make a 3s2p pack. However the weight will obviously be higher with 6 cells vs 3. With the 4 leftover cells, you could still make one 3s1p pack and still even have one cell left over.