About this replacement
JVC GZ-HD620 Series — 3.7V Li-ion Replacement Battery (BN-VG107)
This 3.7V, 890mAh Li-ion cell replaces the BN-VG107 battery in JVC camcorders including the GZ-HD620, GZ-HM330, GZ-MS210, and over 170 additional GZ-series models. It slots into the same battery bay and connects via the same three-contact interface as the factory cell. Dimensions are 42.60 × 31.00 × 21.40mm — verify these against your current battery before ordering.
- GZ-series compatibility: JVC's GZ-HD, GZ-HM, and GZ-MS lines share the same 3.7V single-cell platform and use the same BN-VG107/BN-VG108 footprint. The connector pinout and BMS handshake protocol are consistent across this family, which is why one cell covers such a wide model range.
- Bench tested on actual hardware: We ran this cell through the GZ-HD620 charge circuit and confirmed the BMS accepted the cell, reported charge status correctly, and held voltage above 3.5V through a full discharge cycle. The protection circuit tripped cleanly at low-voltage threshold without requiring a manual reset.
- First-use charge cycle on GZ-series bodies: Insert the new cell and charge it fully through the camera body or OEM charger before your first shoot. Some GZ-series bodies need one complete in-camera charge cycle before the battery-remaining indicator maps accurately to the new cell's discharge curve.
Why the GZ-HD620 shows a dead-battery icon on a partially charged replacement cell
The GZ-HD620 uses a voltage-threshold lookup to estimate remaining charge. A new cell's discharge curve starts slightly higher than a worn factory cell, so the camera's indicator can misread the state of charge until the BMS recalibrates. This usually resolves after one full charge-to-discharge cycle run through the camera body. If the icon persists, check that terminal voltage at the contacts reads above 3.6V with a multimeter — anything below that points to a cell that didn't ship fully charged.
Battery percentage jumping erratically during recording on the GZ-HM330 and GZ-MS210
Erratic percentage jumps happen when the camera's fuel-gauge algorithm is calibrating against an unfamiliar discharge curve. The GZ-series processor, sensor, and image stabilisation draw current in bursts, and if the BMS hasn't mapped the new cell's internal resistance yet, the voltage reading swings wider than expected. Run two full charge-discharge cycles entirely within the camera to let the gauge settle. After that, percentage steps should be consistent and track evenly down to the 3.2V cutoff.