SELECO NP55 Compatible Battery 6V 2100mAh Ni-MH AK2100

SELECO AK2100 / FA114 Series — 6V Ni-MH Replacement Battery

This is a 6V 2100mAh Ni-MH replacement battery for SELECO cameras including the AK2100, FA114, FA116, FA117, and more than a dozen related models. It slots into the battery compartment of compatible SELECO camera bodies and restores power to cameras where the original cell has degraded. Capacity is 2100mAh (12.6Wh), matching the original specification.

• AK2100 and FA-series compatibility: These models share the same battery bay dimensions, 6V operating rail, and connector orientation. The BMS in each body reads the same voltage curve, so one cell covers the full group without hardware modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS handshake completed correctly and the cell held voltage within the expected discharge curve for Ni-MH chemistry at this capacity.
• First-cycle acceptance on SELECO bodies: Run a full charge cycle inside the camera body or OEM charger before your first shoot. Some SELECO bodies map the battery-remaining indicator against a charge profile recorded during that initial cycle — skipping it can cause the display to read inaccurately until the cycle is complete.

Camera showing dead battery indicator on a partially charged replacement cell

Ni-MH cells have a flatter discharge curve than Li-ion, which some camera bodies are not fully calibrated for. The body's fuel gauge samples voltage at rest and maps that to a percentage — but a new Ni-MH cell at 80% charge can sit close to the voltage the body associates with near-empty. One full charge-discharge cycle from inside the camera body lets the BMS recalibrate its reference points. After that cycle, the indicator tracks the actual state of charge more accurately.

Battery percentage jumping erratically on the display mid-shoot

This happens when the camera body maps its display thresholds against a discharge curve it has not yet logged for the new cell. Ni-MH voltage sags briefly under flash or motor load, then recovers — the body reads the sag as a drop and the recovery as a jump. The fix is to complete two full charge cycles through the OEM charger so the BMS has enough data points to smooth the curve. After two cycles, erratic readings typically settle at a stable indicated level until the cell genuinely approaches 5.4V under load.