ORIGINAL: karlik
Ok - looking at HK some of the zippys say 2100 3s 35c, some say 2100 3s1p 40c. What's the difference between a 3s (3cell) and a 3s1p?
The "S" refers to how many series wired cells are in the pack and that determines the overall voltage, Series wired cells increase voltage.
The "P" refers to how many cell rows are then wired in parallel and determines the overall capacity. Parallel wired cells increase capacity.
A 3S 2100 35C is the same as a 3S1P 2200 35 C pack. An 11.1volt pack with one row of 3 cells wired in series. Some don't put the "P" on while some do and it can be confusing .
A 4S2P 4200 35C would be a 14.8 volt pack and would have 2 rows of 4 series wired cells wired in parallel or 8 cells....4 series wired cells on top of 4 series wired cells wired in parallel.
Parallel wiring greatly increases capacity but does not increase the "C" rating or allow you to charge the pack faster.