Casio NP-150 Exilim EX-TR15 Replacement Battery 3.7V 800mAh

Casio Exilim EX-TR15 Series — 3.7V Li-ion Replacement Battery (NP-150)

This is a 3.7V, 800mAh Li-ion cell replacing the NP-150 and NP-10 batteries in the Casio Exilim EX-TR15, EX-TR350, EX-TR10, EX-TR10BE, and compatible models. Same slim profile as the original — 40.12 × 34.00 × 6.72mm — so it seats correctly in the battery bay. Capacity is 800mAh (2.96Wh), matching OEM specification.

• EX-TR series compatibility: These cameras share the same battery bay geometry, 3.7V power rail, and BMS communication protocol across the TR10, TR15, and TR350 lines. One cell works across all three because Casio used an identical battery interface throughout this compact series.
• Bench tested on actual hardware: We cycled this cell through the EX-TR15 body and confirmed the BMS accepted the cell, reported remaining charge without errors, and held voltage within the expected discharge curve under continuous shooting load. No BMS rejection flags appeared during testing.
• First-use charge cycle on EX-TR series: Insert this battery and charge it fully inside the camera body before your first shoot. The EX-TR BMS calibrates its battery-remaining display against a charge cycle completed within the camera — skipping this step can cause the indicator to read inaccurately from the start.

Why the EX-TR15 shows a dead battery icon on a partially charged replacement cell

The EX-TR15 maps its battery indicator to specific voltage thresholds calibrated against the OEM cell's discharge curve. A new third-party cell can present a slightly different open-circuit voltage at rest, which the camera interprets as critically low. This is a display calibration issue, not a fault with the cell. Charge the battery fully inside the camera body — once the BMS completes a full charge cycle, the indicator resets to the correct thresholds and reads accurately.

Battery percentage jumping erratically on the EX-TR display

If the percentage jumps — say, 80% dropping suddenly to 20% mid-session — the camera's voltage-to-percentage mapping is misreading the new cell's discharge curve. The EX-TR series uses a stepped indicator that anchors to fixed voltage points; a fresh cell discharges more flatly than an aged OEM battery, so the steps don't land where the camera expects. Run two full charge-discharge cycles inside the camera body to let the BMS re-anchor its readings. After cycling, the indicator stabilises — look for steady drops rather than sudden jumps as confirmation.