Quasar 500VM-505 Compatible Battery 6V 4200mAh Ni-MH

Quasar 500VM-505 / VM Series — 6V 4200mAh Ni-MH Replacement Battery

This 6V, 4200mAh Ni-MH cell replaces the original battery pack in Quasar's VM-series camcorders and camera units, including the 500VM-505, VM-55, VM-100, VM-110VM, and over 27 additional compatible models. Capacity is rated at 25.2Wh. Dimensions are 88.95 x 47.55 x 36.50mm — match these against your original pack before fitting.

• VM-series platform compatibility: These Quasar models share a common 6V battery architecture with the same connector footprint and BMS voltage thresholds. Swapping across compatible models in this list works because the charge termination logic responds to the same delta-peak voltage signal used across the VM platform.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS accepted charge termination correctly under delta-peak detection and held voltage within expected Ni-MH discharge curves without premature cutoff.
• First-cycle conditioning for accurate indicator readings: Run one full charge through the OEM charger or camera body before shooting. Some Quasar VM-series bodies need a complete charge cycle initiated from within the camera to calibrate the battery-remaining display to a new cell's discharge curve.

Battery percentage jumping or reading 100% then dropping suddenly mid-session

Ni-MH cells have a flatter discharge curve than the lithium chemistries many modern indicator circuits are tuned for. When the camera body maps voltage to a percentage, it can misread the plateau region and then drop sharply once voltage finally falls. This is a calibration gap between the indicator logic and the cell's actual output curve — not a fault with the cell itself. Run two full charge-discharge cycles through the camera body to let the indicator logic reset its reference points. After that, readings stabilise and track the true remaining charge.

Camera body showing dead-battery warning on a replacement cell that just came off the charger

Ni-MH cells can sit at a suppressed resting voltage after shipping or long storage — sometimes below the threshold the camera uses to confirm a valid, charged pack. The body reads that low resting voltage and flags it as a dead or missing battery. Put the cell in the OEM charger first, let it complete a full charge cycle, then reinsert into the camera. Resting voltage should recover to 6V or above and the camera will accept the pack normally.