Datalogic QS6500BT Replacement Battery 3.7V 800mAh 10-4765

Datalogic QS6500BT Series — 3.7V Li-ion Replacement Battery (10-4765)

This 3.7V 800mAh Li-ion battery replaces the original pack in the Datalogic QS6500BT handheld barcode scanner. It fits the QS6500BT, QS65-3030000R, QS65-4040001-401R, QS65-2030000R, and related QS65 variants. Rated at 2.96Wh, it matches the OEM cell format at 52.30 × 15.80 × 15.80mm.

• QS65 series compatibility: The QS65 scanner variants share a common 3.7V single-cell architecture, identical connector pinout, and the same BMS communication protocol. One replacement pack covers the full range without modification.
• Bench tested on actual hardware: We cycled this pack through repeated scan-trigger and wireless polling loads. The BMS held stable cutoff thresholds at both low charge and full charge states, with no false trips during high-frequency scan bursts.
• First-shift charging protocol: After installing the new pack, seat the scanner in its cradle and run a full charge cycle before the first pick-and-pack shift. Scan trigger inrush current peaks when the cell is near minimum voltage — a pre-charged cell prevents a BMS protection trip on the first heavy scan burst.

Cradle showing a charging error on a new pack

The QS6500BT cradle reads pack state through the charging contacts before it commits to a charge cycle. If contact resistance is high — from oxidation, debris, or a slight seating angle — the dock flags a fault rather than charge. This is not a faulty battery. Wipe the gold contacts on the pack and the cradle dock with a dry cloth, then reseat firmly until you feel the latch click. The charge indicator should switch to active within a few seconds.

Scanner losing wireless connection during rapid scan bursts

The QS6500BT runs its Bluetooth radio and scan imager simultaneously during fast scanning sequences. Combined inrush from both draws can cause a momentary voltage sag on a partially charged or degraded cell, dropping the radio link before the BMS trips. If this happens mid-shift, the cell is likely below 3.5V under load. Place the scanner in the cradle until the charge LED shows at least 50%, then resume — the radio connection will stabilise above that threshold.