About this replacement
Fujifilm FinePix HS30EXR / X-Pro1 Series — 7.4V Li-ion Replacement Battery (NP-W126S)
This 7.4V, 1230mAh Li-ion battery replaces the NP-W126S and NP-W126 OEM cells used across the Fujifilm FinePix HS30EXR, HS33EXR, X-Pro1, and over 50 compatible Fujifilm bodies. It matches the original cell's voltage rail, physical footprint (47.20 × 36.20 × 15.50mm), and BMS communication protocol. Capacity is rated at 1230mAh (9.1Wh), identical to the stock specification.
- FinePix HS and X-Pro platform fit: The HS30EXR, HS33EXR, and X-Pro1 share the same battery bay geometry and 7.4V power rail. All three bodies use the same BMS handshake, so one cell covers the full range without modification or adapter.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an HS30EXR body and an X-Pro1. The BMS accepted the cell without error flags, charge termination triggered correctly at 8.4V, and protection circuitry responded to simulated overdischarge at the expected threshold.
- First-use charge cycle on the HS30EXR: Insert the new cell and charge it fully inside the camera body or OEM charger before your first shoot. The HS30EXR's battery-remaining indicator calibrates its display mapping during this first cycle — skipping it often causes the percentage to drop erratically in the first few sessions.
Why the HS30EXR battery indicator reads incorrectly after a cell swap
The HS30EXR maps its battery percentage display against a discharge curve learned from the previous cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The camera reads a mid-range voltage and maps it to the wrong percentage point, making the indicator appear to jump or collapse suddenly. Running one full charge-discharge cycle inside the camera body allows the firmware to re-anchor its voltage threshold table to the new cell's actual curve.
Shot count dropping sharply when shooting with flash or continuous AF
The rated shot count for NP-W126S-powered bodies is measured under controlled CIPA conditions — single shot, flash every other frame, no video. On the HS30EXR, enabling continuous autofocus, shooting bursts, or using the built-in flash on every shot stacks current draws that far exceed the CIPA baseline. The capacitor recharge current for flash alone can pull well above the camera's idle draw. If shot count feels short, check whether flash mode is set to Auto rather than forced-off, and confirm AF is set to single-shot rather than continuous tracking.