NP-90 Casio Exilim EX-H10 Replacement Battery 3.7V 1950mAh

Casio Exilim EX-H10 / EX-FH100 Series — 3.7V Li-ion Replacement Battery (NP-90)

This is a 3.7V, 1950mAh (7.22Wh) Li-ion replacement for the Casio NP-90 battery. It fits the Exilim EX-H10, EX-H10BK, EX-FH100, EX-FH100BK, and several other Exilim models using the same NP-90 footprint. Physical dimensions are 52.30 × 34.00 × 11.40mm — measure your original cell before ordering if you are unsure.

• EX-H10 and EX-FH100 platform compatibility: Both the EX-H10 and EX-FH100 share the same NP-90 battery bay, voltage rail, and contact layout. The BMS in each body reads cell voltage and temperature via the same three-contact interface, so one cell covers both platforms without modification.
• Bench tested on actual hardware: We cycled this cell through the EX-FH100 body using the OEM charger. The BMS accepted the cell on the first charge cycle, reported charge state without error flags, and discharged evenly across the camera's sensor and optical zoom motor load.
• First-use charge cycle on Exilim bodies: Run the first full charge inside the camera body or OEM Casio charger — not a generic USB charger. The EX-H10 BMS maps its battery-remaining indicator against a baseline charge curve it records on that first cycle. Skipping this step causes the indicator to read inaccurately for the life of the cell.

Why the EX-H10 battery indicator drops suddenly during optical zoom bursts

The EX-H10's 10× optical zoom motor draws a short, sharp current spike each time it extends or retracts the lens assembly. At low state of charge, this spike causes a momentary voltage sag that the camera's fuel gauge reads as a near-empty cell, triggering a sudden drop on the indicator. The effect is more pronounced on replacement cells that have not completed their first conditioning cycle. After two or three full charge-discharge cycles, internal resistance settles and the sag narrows. If the drop persists past three cycles, check that resting voltage after a full charge reaches 4.18–4.20V at the contacts.

Battery percentage jumping erratically on the EX-FH100 display

The EX-FH100 maps its percentage display against fixed voltage thresholds set for the original NP-90 discharge curve. A new replacement cell discharges on a slightly different curve until it has been broken in, so the camera's voltage-to-percentage lookup table reads the state of charge inconsistently — jumping from 80% to 40% mid-session is common in the first few uses. This is not a fault with the cell. Run two full discharge-and-charge cycles through the camera body. After conditioning, the display stabilises and tracks closely to the actual cell voltage — confirm by checking contact voltage sits at approximately 3.6–3.7V when the indicator shows roughly half charge.