About this replacement
NiKon Coolpix S610 / S710 / S640 Series — 3.7V Li-ion Replacement Battery (EN-EL12)
This is a 3.7V, 1050mAh Li-ion cell built to the EN-EL12 specification. It fits the NiKon Coolpix S610, S610c, S710, S640, and over 45 additional Coolpix compact bodies. Voltage and connector match the OEM cell exactly.
- Coolpix S-series compatibility: The S610, S610c, S710, and S640 all share the same battery bay geometry, 3.7V supply rail, and EN-EL12 connector pinout. One cell covers all four models without modification.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Coolpix body. The BMS accepted the cell, protection circuits triggered correctly at low-voltage cutoff, and charge termination behaved as expected under the OEM charger.
- First-use charge cycle on Coolpix bodies: Insert the cell and charge it fully inside the camera body or OEM charger before your first shoot. Some Coolpix BMS firmware maps the battery-remaining display only after it reads a complete charge cycle from the new cell — skipping this step can cause the indicator to read inaccurately from the start.
Flash recycling slowdown on the EN-EL12 toward end of charge
The Coolpix S610 and S710 use an onboard capacitor to fire the flash. Recharging that capacitor between shots pulls a short, sharp current spike from the cell. As the EN-EL12 discharges past roughly 3.5V, internal resistance rises enough that the capacitor takes longer to reach full charge. You'll notice the flash-ready indicator takes an extra second or two between shots. This is a normal electrochemical behaviour at low state of charge — swap or recharge the cell when recycling time becomes disruptive.
Battery percentage jumping erratically on the Coolpix display
This happens when the camera's fuel gauge algorithm is still mapped to the discharge curve of the original aged cell. A new EN-EL12 has a flatter voltage curve through mid-charge, which the indicator interprets as sudden jumps between thresholds. Run one complete discharge-to-cutoff followed by a full charge inside the camera body. After that cycle, the BMS recalibrates its reference points and the percentage readout stabilises. If the display still jumps after two cycles, check that cell voltage at full charge reads at least 4.1V.