Most battery banks use a combination of series and parallel wiring.
Series wiring increases voltage but NOT amp/hour capacity.
Parallel wiring increases capacity but NOT voltage.
50mm 14AWG silicone wire.
This connector is great for using two batteries in Parallel. Basically keeping the same voltabe but doubling the Mah. Example: 2 batteries 3 cell 11.1V 2100mah in Parallel = 3 cell 11.1V 4200 Mah