Olympus LI-20B Camedia AZ-1 Replacement Battery 3.7V 1050mAh

Olympus Camedia AZ-1 / AZ-2 Series — 3.7V Li-ion Replacement Battery (LI-20B)

This is a 3.7V Li-ion replacement cell rated at 1050mAh (3.89Wh), built to the LI-20B specification. It fits the Olympus Camedia AZ-1 and AZ-2 Zoom digital cameras. The cell slots into the same battery compartment as the original and uses the same contact orientation.

• AZ-1 and AZ-2 compatibility: Both the AZ-1 and AZ-2 Zoom share the same battery bay dimensions and voltage rail. The LI-20B spec covers both — same connector pitch, same 3.7V nominal, same BMS handshake points. No adapters or modification needed.
• Bench tested on actual hardware: We ran this cell through a charge and discharge cycle, confirmed BMS cutoff at the correct low-voltage threshold, and verified stable voltage output across the operating range. The cell registered correctly on the battery indicator during testing.
• First-install charge cycle: On first use, insert the cell and run a full charge inside the camera body or OEM charger before shooting. Some Camedia-series BMS firmware maps the battery-remaining display to a discharge curve it calibrates on that first cycle — skipping it can cause the indicator to read inaccurately from day one.

Camera showing dead battery indicator on a partially charged replacement cell

The Camedia series maps its battery-remaining indicator to voltage thresholds calibrated against the original cell's discharge curve. A new third-party cell can sit at a slightly different resting voltage after shipping, causing the camera to misread it as empty. This isn't a fault in the cell — it's a display calibration issue. Insert the battery and charge it fully via the OEM charger or camera body before the first shoot to let the BMS register the new cell's baseline.

Battery percentage jumping erratically during a shoot

Erratic percentage jumps usually happen when the camera's voltage-to-percentage map doesn't match the new cell's discharge curve. The LI-20B discharge curve drops fairly flat, then falls steeply near depletion — if the camera firmware expects a steeper mid-range drop, it misreads the remaining charge. The fix is one full charge-discharge cycle inside the camera body, which allows the BMS to re-anchor its threshold table to this cell. After that cycle, readings stabilise and the indicator tracks correctly down to the 3.0V cutoff.