About this replacement
Leica M10 / M10P / M10R — 7.4V Li-ion Replacement Battery (24003 / BP-SCL5)
This 7.4V, 1200mAh Li-ion cell replaces the Leica 24003 / BP-SCL5 battery in the M10, M10P, and M10R rangefinder cameras. It fits the same slot, uses the same connector, and matches the OEM voltage rail the camera's BMS expects. Capacity is 1200mAh (8.88Wh), identical to the original specification.
- M10 / M10P / M10R compatibility: All three bodies share the same battery bay, connector pinout, and BMS communication protocol. A single cell works across the full M10 platform without any modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the M10 platform and confirmed the BMS accepted the cell, reported remaining charge, and held voltage within spec through to the cutoff threshold.
- First-install charge cycle on the M10: Insert the new cell and charge fully via the OEM charger or the camera body before shooting. The M10's BMS calibrates its battery-remaining gauge during this first cycle — skipping it can cause the indicator to read incorrectly from the start.
Why the M10 shows a dead battery indicator on a fresh replacement cell
The M10 maps its battery percentage display to a voltage-threshold curve stored internally. A new cell ships at a partial state of charge — typically around 3.7–3.8V per cell — which falls outside the top of the curve the camera expects after a full charge. The camera can misread this as a low or depleted pack. One full charge cycle through the camera body or the Leica BC-SCL5 charger resets this mapping. After that cycle, the indicator tracks accurately through the full discharge range.
Battery percentage jumping erratically on the M10 display
If the battery percentage skips in large steps or drops suddenly during a shoot, the BMS is losing track of the cell's discharge curve — not losing capacity. This happens when the camera's internal gauge hasn't completed calibration against the new cell's actual voltage-to-capacity profile. Run two full discharge and recharge cycles without removing the battery mid-cycle. After that, the gauge stabilises and tracks to within a few percent. If jumps persist past cycle two, check that the battery contacts in the camera body are clean and making full contact — target a resting voltage of 8.4V fully charged.