JVC BN-V812 GR-DLS1U Camcorder Replacement Battery 7.4V 2000mAh

JVC GR-DLS1U / GR-DV9000 Series — 7.4V Li-ion Replacement Battery (BN-V812)

This is a 7.4V, 2000mAh Li-ion replacement for the JVC BN-V812 and BN-V814 battery. It fits the GR-DLS1U, GR-DV9000, GR-DVL, and GR-DVL9000 camcorders, along with several other models in that family. Capacity is 14.8Wh — matching the original cell specification.

• GR-DLS1U and GR-DV9000 compatibility: Both camcorders share the same 7.4V battery bay, connector pinout, and BMS communication protocol. The BN-V812 and BN-V814 part numbers are interchangeable across this group — same voltage rail, same latch geometry, same data lines.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a GR-DV series body. The BMS accepted the cell without triggering a rejection flag, and the battery indicator tracked consistently through the discharge curve.
• First-use charge cycle on GR-series bodies: Perform one complete charge cycle through the OEM charger or inside the camcorder body before extended recording. Some JVC BMS firmware requires a camera-side charge cycle to calibrate the battery-remaining display to the new cell's discharge curve.

Why the GR-DLS1U shows a dead battery indicator on a partially charged replacement cell

JVC's battery gauge maps voltage thresholds to a fixed discharge curve stored in the camcorder's firmware. A new cell has a slightly different internal resistance profile than the aged original it replaces. The body reads the voltage at rest, compares it to the stored curve, and can display empty or one bar even when the cell holds a good charge. Running one full charge-discharge cycle from inside the camcorder body recalibrates that mapping. After that cycle, the indicator typically tracks the actual state of charge accurately.

Battery percentage jumping erratically during recording on the GR-DV9000

Erratic percentage jumps during active recording usually point to voltage sag under load — the camcorder's processor, LCD, and tape transport all draw simultaneously, pulling the terminal voltage down sharply. The firmware interprets that sag as a steeper drop in charge level and updates the display accordingly. If the jumps stabilise after a few minutes of recording, the cell is behaving normally as it settles into the discharge curve. If the display is jumping more than two bars during steady recording, check that the battery contacts on both the cell and the bay are clean and making full contact — oxidised contacts increase resistance and amplify voltage sag.