About this replacement
JVC GR-D240 Series — 7.4V Li-ion Replacement Battery (BN-VF733)
This is a 7.4V, 3300mAh Li-ion battery pack replacing the BN-VF733 in JVC MiniDV camcorders. It fits the GR-D240, GR-D246, GR-D247, GR-D250, and over 40 additional GR-series models. Same voltage, same connector, same form factor as the original pack.
- GR-series platform fit: JVC's mid-2000s MiniDV line shared a common battery bay and contact layout across the GR-D and GR-X families. All confirmed compatible models run the same 7.4V rail with identical BMS communication pins — one pack covers the full range.
- Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a GR-D240 body. The BMS handshake completed without fault codes, and the battery-remaining indicator tracked normally through the discharge curve.
- First-use charge cycle on camcorder body: Charge this pack inside the JVC camcorder on first use — not in a third-party standalone charger. The GR-series BMS maps the discharge curve to the indicator display during the first in-body charge cycle. Skipping this step can cause the battery bar to display inaccurately for the life of the pack.
Why the GR-D240 shows a dead battery indicator on a freshly charged replacement cell
The GR-D240 uses a voltage-threshold system to estimate remaining charge. A new cell fresh off a third-party charger can present a slightly different resting voltage than the camera expects at "full." The BMS reads this as a partially or fully depleted pack and triggers the low-battery warning immediately. Charging the pack directly inside the camera body recalibrates the threshold mapping. After one full in-body charge cycle, the indicator should read correctly.
Battery percentage jumping erratically mid-recording on GR-D240
This happens when the camcorder's fuel-gauge circuit hasn't yet mapped the new cell's discharge curve. The original BN-VF733 had a known voltage-vs-capacity profile baked into the camera firmware. A replacement cell with a slightly different discharge slope causes the indicator to jump between readings rather than step down gradually. Run two full charge and discharge cycles inside the camera body. By the second cycle, the display should stabilise and track linearly down to the 7.0V cutoff.