Panasonic WV-BWC4000 Replacement Battery 3.6V 2600mAh

Panasonic WV-BWC4000 Series — 3.6V Li-ion Replacement Battery (57588-001)

This 3.6V, 2600mAh Li-ion battery replaces the OEM 57588-001 cell in the Panasonic WV-BWC4000, WV-BWC4000B, WV-BWC4000E, and i-Pro BWC4000 body-worn cameras. These units are used in law enforcement and security fieldwork where continuous recording is critical. Dimensions are 71.50 x 33.10 x 24.50mm — the pack slots into the same bay as the original without modification.

• WV-BWC4000 platform compatibility: All four models in this series share the same 3.6V battery bay, connector pinout, and BMS handshake protocol, which is why one replacement cell covers the full range including the i-Pro rebranded variant.
• Bench tested on actual hardware: We ran this pack through the WV-BWC4000's power-up self-check sequence. The BMS negotiated correctly, the camera passed its internal diagnostics, and the battery indicator displayed a full-charge state without error flags.
• Shift-start verification: After inserting this battery, power the camera on before leaving base and confirm the ready-status indicator clears. The BWC4000 runs a firmware self-check on every cold start — skipping this step in the field means you may not catch a rejected battery until recording has already failed.

Recording cuts out mid-incident on the WV-BWC4000

The BWC4000 draws simultaneously from the battery for video encoding, cellular upload, and GPS logging when all features are active. That combined load can spike high enough to trigger the BMS protection circuit, which cuts power to protect the cell. The camera will appear to freeze or stop recording without warning. To recover, power cycle the unit — the BMS resets on restart and recording resumes normally from that point.

Battery indicator showing low after a short recording session

A new Li-ion cell often reads lower than expected for the first few cycles because the BMS hasn't yet calibrated its state-of-charge model to the actual cell capacity. This is not a fault with the battery. Run two or three full discharge-and-charge cycles through normal camera use and the indicator will stabilise. If the reading still drops rapidly after three cycles, check that the camera's firmware is current — outdated firmware can misreport charge levels against the 57588-001 cell spec.