Vivitar DVR-850W Replacement Battery BLI-885 3.7V 900mAh Li-ion

Vivitar DVR-850W / ViviCam 8027 Series — 3.7V Li-ion Replacement Battery (BLI-885)

This is a 3.7V, 900mAh Li-ion cell built to replace the original BLI-885 battery in the Vivitar DVR-850W compact camcorder and ViviCam 8027. It fits the same physical bay and uses the same connector pinout as the factory cell. Capacity figures come directly from our product data — 900mAh / 3.33Wh.

• DVR-850W and ViviCam 8027 compatibility: Both cameras share the same battery bay dimensions (46.20 × 34.14 × 5.68mm), voltage rail, and three-pin contact layout — that is why one cell covers the full model group. No adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through full discharge and charge sequences on the DVR-850W platform. The BMS engaged correctly at both low-voltage cutoff and charge termination — no false triggers or premature shutoffs during testing.
• First-cycle fuel gauge reset: After fitting this cell, run one complete discharge down to automatic shutoff, then charge uninterrupted to 100% before use. The camera's fuel gauge IC calibrates its percentage readings against that first full cycle — skipping it causes erratic percentage display from the start.

Why the DVR-850W shows the wrong battery percentage after a cell swap

The DVR-850W uses a coulomb-counting fuel gauge IC that builds its discharge model from the original cell's charge curve. When a new cell goes in, that stored model no longer matches the actual cell chemistry. The gauge reads voltage offsets against stale reference data and reports percentages that are off by 10–20%. One full discharge-to-shutoff cycle followed by a complete charge forces the IC to rebuild its curve against the new cell. After that single cycle, percentage readings stabilise.

Sudden camera shutoff while the percentage still shows 25–35%

This is a voltage cliff failure, not a capacity problem. Li-ion cells cannot sustain output voltage under load once internal resistance climbs past a threshold — the DVR-850W's processor sees voltage drop below its minimum operating rail and cuts power instantly. The fuel gauge, which tracks charge by counting current rather than measuring load voltage, still thinks capacity remains. If this happens on a new cell, run the first-cycle calibration sequence described above. If it persists after two full cycles, check that the battery contacts in the bay are clean and making full contact — oxidised contacts add resistance and trigger the same cliff at a higher remaining charge.