About this replacement
JVC GZ-HD620 / GZ-HM330 Series — 3.7V Li-ion Replacement Battery (BN-VG114)
This is a 3.7V, 1200mAh Li-ion cell built to OEM part number BN-VG114, covering the JVC GZ-HD620, GZ-HD620BAH, GZ-HM330, GZ-MS210, and over 170 additional JVC camcorder models. It slots directly into the battery bay and connects via the same three-contact interface as the original JVC pack. Voltage and capacity match the original spec exactly — 3.7V, 1200mAh (4.44Wh).
- GZ-HD620 and GZ-HM330 platform fit: These models share the same BN-VG114 form factor, connector pinout, and BMS communication protocol. One cell works across the entire range because JVC standardised the battery interface across this camcorder generation — swapping between compatible bodies requires no adapter.
- Bench tested on actual hardware: We ran this cell in a GZ-HD620 body through a full charge and discharge cycle. The BMS accepted the cell on first install, charge termination triggered correctly at 4.2V, and the camera's battery indicator tracked the discharge curve without jumping or stalling.
- First-use charge cycle on GZ-series bodies: Insert the battery and charge it through the camera body or OEM charger before your first recording session. The GZ-series BMS maps its remaining-charge display against an internal discharge profile — it needs one complete in-body charge cycle to calibrate the indicator accurately for a new cell.
Battery percentage reading frozen or stuck on the GZ-HD620 display
The GZ-HD620 uses a voltage-threshold model to estimate remaining charge — it reads cell voltage at intervals and maps that to a percentage on screen. A new third-party cell has a slightly different discharge curve than the aged OEM pack the camera was last calibrated against. This mismatch causes the indicator to hold at one value, then drop sharply as voltage falls below the next threshold. One full in-body charge cycle resets the reference point and the indicator will step down normally from that point.
Camera body warm to touch during sustained HD recording
HD recording on the GZ-HD620 pulls current simultaneously from the image sensor, the video processor, and the optical image stabilisation system — combined draw is significantly higher than in playback or standby. This sustained current draw generates heat at both the cell and the camera's internal regulators, which is normal under continuous recording load. If the body becomes uncomfortably hot and the camera shuts down, check that the battery contacts are clean and seated fully — a high-resistance contact forces the cell to push more voltage to compensate, increasing heat. Clean the contacts with a dry cloth and reseat the battery before the next session.