Agfa Optima 1338 Li-ion Replacement Battery 3.7V 720mAh

Agfa Optima 1338 / 2338 Series — 3.7V Li-ion Replacement Battery

This 3.7V, 720mAh Li-ion cell fits the Agfa Optima 1338, Optima 1338mT, Optima 2338, and Optima 2338MT compact digital cameras. It powers the image sensor, LCD display, and flash capacitor circuit from a single flat-pack cell. When the original cell no longer holds a charge, this replacement restores full camera operation.

• Optima 1338 and 2338 series fit: These models share the same battery bay dimensions, 3.7V nominal voltage rail, and contact configuration — the 1338mT and 2338MT variants use the same form factor as the base models, so one cell covers all four.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Optima platform. The BMS accepted the cell without rejection events, flash recycling stayed consistent, and the charge indicator tracked correctly across the discharge curve.
• First-install charge protocol: Seat the battery and charge it fully inside the camera body or OEM charger before shooting. Some Optima BMS firmware requires a complete in-body charge cycle to calibrate the battery-remaining display to the new cell's discharge curve.

Flash output dropping mid-shoot on a new Optima battery

The Optima's flash capacitor draws a concentrated burst of current each time it recharges after a shot. As the cell voltage drops toward the lower end of its discharge curve, the capacitor takes longer to reach full charge voltage. This shows up as slower flash recycling and occasionally reduced flash intensity. It is not a fault — it is the capacitor recharge circuit responding to available cell voltage. If it happens early in a session on a new cell, the cell likely did not complete a full first charge cycle.

Battery percentage jumping erratically on the Optima display

The Optima's fuel gauge maps voltage thresholds from the original cell's discharge curve to percentage steps on the display. A new replacement cell discharges along a slightly different curve, so the camera firmware can misread remaining capacity and skip percentage steps. This is a calibration issue, not a defective cell. Run two full charge-discharge cycles in the camera body and the display will stabilise as the BMS learns the new cell's voltage profile.