SELECO NP-66 Replacement Battery 6V 4200mAh Ni-MH

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

This is a 6V, 4200mAh Ni-MH replacement battery for Minolta DiMAGE cameras that use the NP-66 battery format. It fits the AK2100, FA114, FA116, FA117, and 11 additional models in the same family. Physical dimensions are 88.95 × 47.55 × 36.50mm — measure your current cell before ordering if you are unsure.

• AK2100 and FA-series compatibility: These models share the same 6V NP-66 voltage rail and connector pinout, so a single cell covers the full lineup. The BMS in each body reads cell voltage the same way — no model-specific firmware variation applies here.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on DiMAGE-series bodies. The BMS accepted the cell without lockout, and the protection circuit tripped correctly at low-voltage cutoff without requiring a manual reset.
• First-cycle conditioning for accurate meter reading: Run the first full charge inside the camera body or the OEM charger — not a third-party charger. Some DiMAGE bodies calibrate their battery-remaining display only during a charge cycle completed through the camera itself. Skipping this step causes the indicator to jump erratically from the first shot.

Flash recycling lag on a fresh Ni-MH cell in DiMAGE bodies

Ni-MH cells at less than 3–5 cycles do not deliver peak current as consistently as a broken-in cell. The onboard flash capacitor pulls a sharp recharge current between shots, and an unconditioned cell shows a brief voltage sag during that draw. The camera body interprets this sag as low battery and may slow flash recycling or flag a warning. After 3–5 full charge-discharge cycles, internal resistance drops and the sag narrows — flash recycling returns to normal timing.

Battery percentage jumping erratically on the DiMAGE display

Ni-MH discharge curves are flatter than Li-ion, which makes voltage-based fuel gauging less accurate. The DiMAGE BMS maps voltage thresholds to percentage bands, and a new cell's curve may not align with the camera's lookup table until the cell has been cycled. You may see the indicator drop from 80% to 20% with no warning, then recover slightly. Complete two full charge-discharge cycles and the reading stabilises — the BMS re-maps at approximately 5.4V as the low-end threshold.