BP-5M AgfaPhoto Realishot WP8000 Replacement Battery 3.7V 500mAh

AgfaPhoto Realishot WP8000 — 3.7V Li-Polymer Replacement Battery (BP-5M)

This is a 3.7V, 500mAh Li-Polymer replacement battery for the AgfaPhoto Realishot WP8000 waterproof compact camera. It replaces OEM part number BP-5M and fits directly into the camera's battery compartment. Capacity matches the original cell at 1.85Wh.

• Realishot WP8000 fit: The WP8000 uses a slim Li-Polymer form factor — 40.20 x 33.50 x 5.60mm — to fit within the sealed waterproof chassis. The BP-5M cell matches that footprint and the voltage rail the camera's BMS monitors at startup.
• Bench tested on actual hardware: We cycled this cell through a full charge and discharge on the bench. The BMS accepted the cell without rejection errors, and voltage held stable across the discharge curve until the low-voltage cutoff triggered cleanly at the expected threshold.
• First-install charge cycle on the WP8000: Insert the new cell and run one full charge through the camera body or OEM charger before shooting. The WP8000's BMS maps its battery-remaining display against the cell's discharge curve — skipping this step often causes the indicator to read incorrectly from the first shot.

Dead battery indicator on the WP8000 with a partially charged replacement cell

The WP8000 reads battery state by comparing resting voltage against a stored threshold map. A new Li-Polymer cell fresh out of packaging often sits at a partial charge — typically 3.7–3.8V — which can fall inside the camera's low-battery warning zone before any calibration has occurred. This causes the dead-battery icon to appear even though the cell has usable charge. One full charge cycle from inside the camera body resets the reference point and clears the false reading.

Battery percentage jumping erratically on the WP8000 display

This happens when the camera's indicator firmware is mapping percentage against a discharge curve calibrated to a partially degraded original cell. A new BP-5M replacement has a slightly different voltage-to-capacity profile, so the percentage readout can jump — for example, from 60% down to 20% in a few shots. The fix is to run two to three full charge and discharge cycles through the camera body. After that, the BMS recalibrates its threshold mapping to the new cell and the readout stabilises.