About this replacement
Panasonic AG-DVC62 / NV-MX500 Series — 7.4V Li-ion Replacement Battery (CGA-D54)
This is a 7.4V, 7800mAh (57.72Wh) Li-ion replacement for the Panasonic CGA-D54 battery cell. It fits the AG-DVC62 professional camcorder and a broad range of Panasonic NV-series camcorders including the NV-MX500, NV-MX350, and NV-GX7. The connector and BMS handshake match the OEM spec used across these models.
- AG-DVC62 and NV-series platform fit: These camcorders share the same 7.4V battery rail, InfoLithium-style BMS communication protocol, and D-series locking connector. A single cell design covers all of them because Panasonic standardised this battery architecture across their DV and MX lines from the same production era.
- Bench tested on actual hardware: We ran this cell on an AG-DVC62 body and monitored the BMS handshake through full charge and discharge cycles. The protection circuit responded correctly to charge termination and low-voltage cutoff without triggering false depletion alerts on the camera's battery indicator.
- First-use cycle on the camera body: Fit this battery into the AG-DVC62 and run one complete charge cycle through the camera body or the OEM charger before your first shoot. Some Panasonic BMS systems need that initial cycle to calibrate the battery-remaining display — skipping it can cause the indicator to read inaccurately from the first session.
Why the AG-DVC62 battery indicator reads full then drops suddenly mid-recording
The AG-DVC62 maps its battery-remaining display against a voltage discharge curve calibrated to the original CGA-D54 cell. A new replacement cell — even one with identical capacity — can have a slightly different discharge slope, especially in the upper charge range. The camera reads the starting voltage as 100% but then recalibrates mid-session when the curve diverges from the stored map. Running one full charge-discharge cycle from within the camera body allows the BMS to re-map its thresholds against the actual cell behaviour.
Battery percentage jumping erratically on the AG-DVC62 display
Erratic percentage jumps — where the display skips from 60% to 20% without warning — point to a voltage-threshold mismatch between the replacement cell's discharge curve and the camera's stored reference values. This is not a fault with the cell itself; the capacity is intact. The camera's indicator is simply using the wrong reference points. Perform one full charge-to-empty cycle in the camera body, which forces the BMS to resample the curve at actual load. After that cycle, the display should track the true charge state within a few percentage points across the full range.