About this replacement
Fujifilm FinePix S5 Pro / IS Pro — 7.4V Li-ion Replacement Battery (NP-150)
This 7.4V 1500mAh Li-ion cell replaces the Fujifilm NP-150 battery. It fits the FinePix S5 Pro and IS Pro camera bodies. Voltage and capacity match OEM spec exactly — 7.4V, 1500mAh (11.1Wh).
- FinePix S5 Pro and IS Pro compatibility: Both bodies share the same NP-150 battery bay, connector pinout, and BMS handshake protocol. A single cell works across both platforms without modification.
- Bench tested on actual hardware: We cycled this cell through the S5 Pro body. The BMS accepted the cell on first install, voltage draw was stable across autofocus, live view, and LCD operation, and the protection circuit tripped correctly at low-voltage cutoff.
- First-charge protocol on the S5 Pro and IS Pro: Run one full charge cycle through the OEM charger or directly in the camera body before heavy shooting. The S5 Pro BMS maps its battery-remaining display against a learned discharge curve — skipping this step causes the indicator to read inaccurately until the camera completes one full cycle.
Why the S5 Pro battery percentage display jumps after fitting a new cell
The S5 Pro stores a discharge curve profile from the previous battery. A new cell has a different internal resistance, so voltage readings at each state of charge map differently to the camera's stored thresholds. The indicator can jump from 80% to 20% with no warning, or stall at a fixed number for extended periods. Running one full charge-discharge cycle inside the camera body resets the mapping to the new cell's actual curve.
Camera body warm during extended RAW burst shooting — what's drawing the current
The S5 Pro runs a 12.3MP Super CCD SR sensor derived from the Nikon D200 body, and the image processor, dual-layer sensor readout, and buffer write all pull current simultaneously during burst shooting. This combined draw raises cell temperature faster than standard shooting. If the body feels warm after sustained bursts, let the cell rest for two to three minutes before the next sequence. Monitor cell voltage — if the camera shuts off above 6.8V, the BMS thermal protection has tripped, not low charge.