14S9P battery case — 126 cells, 52 V

Short answer: 5 of our 110 housings take a 14S9P on 18650. 1 of those leave at least six cells of room — which is the practical minimum once a 14S BMS and the wiring are in.

The pack, in numbers

Capacity assumes 3.5 Ah per 18650 cell. Your cells will differ — the cell count and the voltage are exact, the capacity is a working figure.

Housings that take it

Why room left matters more than the ceiling. A housing listed at 126 cells holds your pack exactly and nothing else — no BMS, no nickel, no cable exit. In practice a 14S pack needs roughly six cells of space beyond the cells themselves, because a 14S BMS is longer than the 10S board these moulds were designed around. That is the single most common reason a build that “fits” does not close. There is a longer explanation in why your 13S5P pack will not fit.

Work out your own configuration

The pack calculator does this for any series and parallel count, and the case selector takes a plain cell count if you already know it.

What 1588 Wh actually gets you

The figure above is energy, not distance. A 14S9P pack on 18650 works out to about 1588 Wh, which is roughly 132–198 km on low assist and 50–72 km at full assist for a 75 kg rider on mixed terrain. How far a pack will take you explains what moves that figure, and how the same configuration on the other cell format compares.