Ricoh WG-M2 Replacement Battery 3.7V 800mAh Li-ion

Ricoh WG-M2 / WG-M1 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 800mAh Li-ion replacement battery for the Ricoh WG-M2 and WG-M1 action cameras. It slots directly into the battery bay on either body and connects to the same BMS interface as the original cell. Capacity figures come from the product data — 2.96Wh at rated voltage.

• WG-M2 and WG-M1 platform: Both cameras share the same battery bay geometry, connector pinout, and BMS communication protocol. One cell fits both bodies without modification or adapter.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a camera-class BMS test rig. The protection circuit responded correctly to cutoff thresholds, and the cell held voltage within expected tolerance across the discharge curve.
• Cold-weather shooting tip: The WG-M2 is built for outdoor use, including cold conditions — but Li-ion cells lose usable capacity below 5°C. Keep a spare cell in an inside jacket pocket between swaps so it enters the camera closer to ambient body temperature rather than ambient air temperature.

Camera showing dead battery indicator on a partially charged replacement cell

The WG-M2's battery indicator maps voltage thresholds to a discharge curve calibrated to the OEM cell. A new third-party cell can present a slightly different resting voltage at the same state of charge, which the camera misreads as critically low. This is a BMS calibration issue, not a faulty cell. Run one full charge cycle through the OEM charger or via the camera body's USB charging port, then discharge normally — the indicator typically stabilises after one complete cycle.

Battery percentage jumping erratically on the WG-M2 display

Erratic percentage readings happen when the camera's voltage-to-percentage mapping doesn't align with the new cell's discharge curve shape. The WG-M2 samples terminal voltage at intervals and converts it to a percentage — if the cell's mid-discharge voltage plateau sits slightly higher or lower than the OEM reference, the display jumps. This is a display calibration artefact, not a capacity problem. Complete two full charge-discharge cycles and the indicator will track more accurately as the camera logs the new cell's behaviour.