Lawmate DV500 Replacement Battery 3.7V 1800mAh Li-ion

Lawmate DV500 / PV500 / PV1000 Series — 3.7V Li-ion Replacement Battery

This 3.7V, 1800mAh lithium-ion battery fits the Lawmate DV500 and PV500 portable digital video recording devices, along with the PV700 and PV1000. It delivers the same voltage rail as the original cell, keeping recording sessions running without a hardware mismatch. Dimensions are 53.00 × 35.30 × 11.00mm — verify your bay clearance before installing.

• DV500 / PV500 / PV1000 platform fit: These Lawmate recorders share a common form factor and 3.7V single-cell architecture. The same physical footprint and voltage rail makes one cell compatible across the range — but always check the label on your depleted original to confirm polarity orientation before swapping.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench and monitored the BMS cutoff thresholds. The protection circuit tripped correctly at both the low-voltage floor and the high-voltage ceiling, consistent with standard Li-ion single-cell tolerances.
• First-cycle initialisation on Lawmate recorders: Run one complete charge cycle through the device body or OEM charger before sustained recording. Some Lawmate BMS firmware maps the battery-remaining indicator against a calibrated charge curve — skipping this step can cause the indicator to jump or show empty prematurely.

Why Lawmate recorders show a dead-battery icon on a fully charged replacement cell

The DV500 and PV500 use a voltage-threshold lookup to estimate remaining charge. A new replacement cell sits at a slightly different resting voltage than a broken-in original, which can push the reading outside the device's expected range. The recorder interprets this as a fault and displays the empty icon even when the cell holds a full charge. One full charge-discharge cycle inside the device re-anchors the threshold map to the new cell's actual discharge curve.

Battery percentage jumping erratically during recording

Erratic percentage readings on Lawmate recorders are almost always a calibration mismatch, not a faulty cell. The firmware maps voltage steps to percentage bands based on an assumed discharge curve — a new cell with a slightly different internal resistance reads differently at each step. The fix is straightforward: charge the battery to 100% in the device, record until the low-battery warning triggers, then charge fully again. After that single conditioning cycle, the percentage display stabilises to within a few points of actual remaining capacity.