NiKon EN-EL24 1 J5 Replacement Battery 7.2V 850mAh

NiKon 1 J5 — 7.2V Li-ion Replacement Battery (EN-EL24)

This 7.2V, 850mAh Li-ion cell replaces the EN-EL24 battery in the NiKon 1 J5 mirrorless camera. It powers the sensor, autofocus system, and electronic viewfinder at the same voltage as the original. Capacity matches the OEM specification at 850mAh (6.12Wh).

• 1 J5 compatibility: The 1 J5 uses the EN-EL24 form factor — a slim 46.90 × 29.02 × 13.04mm cell with a specific contact layout. This cell matches that footprint and pin arrangement so the door closes and the BMS handshake completes without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 1 J5 body. The BMS accepted the cell after one full charge cycle and reported state-of-charge accurately throughout the discharge curve.
• First-install charge cycle on the 1 J5: Charge this cell fully inside the camera body or OEM charger before your first shoot. The 1 J5 BMS maps its battery-remaining indicator against a discharge profile it learns on the first full cycle — skipping this step causes the percentage display to jump erratically early on.

Why the 1 J5 rejects a new EN-EL24 replacement on first install

The 1 J5 runs an authentication check each time a new cell is seated. If the battery hasn't completed a charge cycle through the camera or OEM charger, the body may display an incompatible battery warning even on a valid cell. This is a BMS initialisation issue, not a defective battery. Power cycle the camera once with the cell seated, then charge fully via the body or OEM charger to clear the flag.

Battery percentage jumping erratically mid-shoot

The 1 J5 maps its percentage display to voltage thresholds calibrated against its discharge curve. A new replacement cell discharges at a slightly different rate than a worn OEM cell, so the indicator can drop sharply then hold, or jump from 50% to 20% without warning. This is a calibration mismatch, not capacity loss. One full charge-discharge cycle inside the camera body resets the threshold mapping and stabilises the display — charge to 8.4V, shoot until the camera shuts off, then recharge fully.