About this replacement
Fujifilm FinePix F440 / F450 Series — 3.7V Li-ion Replacement Battery (NP-30)
The NP-30 is a 3.7V, 300mAh lithium-ion cell for the Fujifilm FinePix F440, F440 Zoom, F450, and F450 Zoom compact digital cameras. It slots directly into the same battery bay as the original and connects via the same three-contact interface. Capacity is 300mAh (1.11Wh), matching the OEM specification.
- F440 and F450 platform fit: Both camera bodies share the same NP-30 battery bay, contact layout, and BMS handshake protocol — the same cell services the full FinePix F440/F450 range, including Zoom variants.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the FinePix platform. The BMS accepted the cell on first insertion, reported battery status correctly, and held voltage within the expected discharge curve throughout the test.
- First-cycle BMS calibration on the F440/F450: On first use, run one full charge cycle inside the camera body using the OEM cable or AC adapter. The FinePix BMS maps its battery-remaining indicator to a known discharge curve — skipping this step can cause the display to read inaccurately from the start.
Flash recycling slowdown on the NP-30 toward end of discharge
The FinePix F440 and F450 route flash capacitor recharge current directly through the main battery rail. As cell voltage drops toward the lower end of discharge, the current available to the capacitor decreases. The flash takes noticeably longer to recycle between shots — sometimes several seconds — even when the battery indicator still shows charge remaining. This is a cell-voltage effect, not a fault. Swap to a freshly charged NP-30 when recycling time exceeds two seconds.
Battery percentage jumping erratically on the F440 display
The FinePix F440 maps its on-screen battery indicator to fixed voltage thresholds calibrated to the OEM cell's discharge curve. A new replacement cell can have a slightly different curve shape, so the indicator jumps between levels rather than stepping down smoothly. This is a display mapping issue, not a capacity problem. Run two to three full charge-discharge cycles in the camera body and the BMS will adjust its threshold tracking to the new cell's curve.