Casio NP-70 Exilim Zoom EX-Z250BE Replacement Battery 3.7V 1050mAh

Casio Exilim Zoom EX-Z250 / EX-Z150 Series — 3.7V Li-ion Replacement Battery (NP-70)

This is a 3.7V, 1050mAh (3.89Wh) Li-ion cell built to the NP-70 specification. It fits the Casio Exilim Zoom EX-Z250BE, EX-Z250GD, EX-Z250PK, EX-Z150, and over ten additional Exilim compact models. Swap it in when your original NP-70 no longer holds a full charge or fails to power the camera on.

• Exilim Zoom EX-Z250 and EX-Z150 platform: These compact Exilim bodies share the same NP-70 footprint, voltage rail, and battery-door connector geometry. One cell covers the full range listed above without any adapter or modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench. The BMS engaged correctly at both the high-voltage cutoff and the low-voltage floor, and the camera body reported charge state without errors after one full charge cycle.
• First-use charge cycle for accurate indicator display: Charge the new cell fully inside the camera body or OEM charger before your first shoot. Some Exilim BMS firmware maps remaining capacity to a voltage curve learned during that initial cycle — skipping it can cause the battery indicator to read inaccurately for the first several sessions.

Why the Exilim EX-Z250 shows a dead-battery icon on a partially charged replacement cell

The EX-Z250's battery indicator maps remaining charge to a fixed voltage lookup table stored in firmware. A new Li-ion cell has a slightly different discharge curve than a worn original, so the camera can misread voltage and flag a low-battery warning even when the cell is at 60–70% capacity. This is not a fault with the replacement cell. One full charge-to-4.2V cycle inside the camera body gives the BMS enough data to re-anchor its threshold mapping. After that cycle, the indicator tracks normally.

Battery percentage jumping erratically on the EX-Z250 display

Erratic percentage jumps — say, 80% dropping to 20% in a single shot — point to a voltage-threshold mismatch between the new cell's discharge curve and the camera's indicator firmware. It is most visible in the first few charge cycles on a fresh cell. The fix is to run two or three full discharge-and-recharge cycles: shoot until the camera shuts itself off at the low-voltage cutoff, then charge fully to 4.2V each time. The readings stabilise once the BMS has sampled the new cell's actual voltage behaviour across its full range.