Panasonic CGR-D320 Replacement Battery 7.4V 3300mAh

Panasonic AG-DVC15 Series — 7.4V Li-ion Replacement Battery (CGR-D320)

This 7.4V, 3300mAh (24.42Wh) Li-ion cell replaces the CGR-D320, VW-VBD25, and CGP-D28S across the Panasonic AG-DVC15, CGR-D28A/1B, CGR-D28SE/1B, CGR-D320A/1B, and 29 additional compatible models. It slots directly into the battery compartment and draws power through the same contact array as the OEM pack. Capacity figure is 3300mAh — matched to the original specification.

• AG-DVC15 platform compatibility: These models share the same 7.4V battery rail, identical connector pinout, and a common BMS handshake protocol — which is why one cell covers the full CGR-D series lineup without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the AG-DVC15 body. The BMS accepted the pack, reported charge status correctly, and the protection circuit tripped at the expected low-voltage cutoff without shutting down mid-recording.
• First-use charge cycle on AG-DVC15: Run the first full charge through the camera body or OEM charger before a shoot. The AG-DVC15 BMS calibrates its remaining-charge display against the cell's discharge curve during that initial cycle — skipping it causes the battery indicator to read inaccurately throughout the pack's life.

AG-DVC15 battery indicator freezing or jumping during recording

The AG-DVC15 maps remaining charge to a voltage-threshold table stored in the camera body. A fresh replacement cell has a discharge curve that starts slightly higher than an aged OEM pack, so the camera's threshold table misreads the early voltage plateau and freezes the indicator. As the cell drops into the mid-discharge range, the voltage aligns with the camera's table and the indicator catches up in a jump. One complete charge and discharge cycle through the camera body recalibrates the mapping. After that cycle, the indicator tracks correctly down to the 7.0V cutoff.

AG-DVC15 showing no battery or refusing to power on with new cell installed

This happens when the BMS in the replacement cell ships in a partially discharged state and the camera body's initialisation handshake times out before receiving a valid voltage response. The camera interprets the slow response as a missing or faulty pack and blocks power-on. Place the cell in an OEM-compatible external charger first and bring it to full charge — typically to 8.4V at the charger's termination point. Reinstall into the camera body and power on. That charge state gives the BMS enough headroom to complete the handshake within the camera's timeout window.