Fujifilm NP-100 DS260 Replacement Battery 3.7V 1850mAh

Fujifilm DS260 / MX-500 Series — 3.7V Li-ion Replacement Battery (NP-100)

This is a 3.7V, 1850mAh Li-ion cell built to the NP-100 specification. It fits the Fujifilm DS260, DX-9, FinePix MX-600, MX-500, and several additional Fujifilm compact camera bodies that share the same battery bay and connector. Swap it in when the original cell no longer holds a full charge or fails outright.

• DS260 and MX-500 series compatibility: These models share the NP-100 form factor — same 3.7V rail, same physical dimensions, same connector orientation. The BMS on each body communicates with the cell over the same contact points, so one cell covers the full group without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on camera hardware. The BMS accepted the cell cleanly, current draw during shutter actuation and LCD operation held within expected range, and the protection circuit triggered correctly at low-voltage cutoff.
• First charge on the DS260: Run the first full charge cycle through the camera body itself, not an aftermarket charger. The DS260's BMS maps the new cell's discharge curve during that initial in-body charge — skipping it can cause the battery indicator to read inaccurately for several cycles afterward.

Battery percentage jumping on the DS260 display after fitting a new NP-100

The DS260 uses voltage thresholds to estimate remaining charge and maps those thresholds to the original cell's discharge curve. A fresh NP-100 replacement cell has a slightly different discharge profile at mid-range voltages, which can cause the indicator to skip between readings — for example, dropping from 60% to 30% in a single frame. This is a calibration gap, not a cell fault. Complete two to three full charge and discharge cycles through the camera body, and the indicator will stabilise as the BMS learns the new cell's actual curve.

Flash taking noticeably longer to recycle between shots

Flash capacitor recharge pulls a sustained current spike each time the flash fires — this is one of the highest single-draw events a compact camera generates. If the cell voltage sags below roughly 3.4V under that load, the capacitor recharges slowly and the ready indicator is delayed. This typically shows up late in a session when the cell is below 30% remaining. Charge the battery fully before a shoot where flash use is expected, and avoid continuous flash-heavy sequences when the indicator shows under half capacity.