Unitech HT660 Replacement Battery 3.7V 1800mAh Li-ion

Unitech HT660 / PA600 / PA950 Series — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1800mAh Li-ion replacement battery for the Unitech HT660, PA600, PA950, and PA966 handheld barcode scanners. These mobile data terminals are used in retail, warehouse, and logistics operations where continuous scan availability matters. It measures 57.23 × 37.00 × 12.68mm and fits the original battery compartment without modification.

• HT660 / PA600 / PA950 / PA966 platform fit: These models share the same 3.7V battery bay, connector pinout, and BMS handshake logic, which is why a single replacement pack covers the full group. Voltage tolerance across this series sits within a narrow window — a cell outside spec will trip the protection circuit before the shift starts.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the HT660 platform. The BMS accepted the cell, held the 3.7V nominal rail through simulated scan-and-transmit bursts, and the protection circuit responded correctly at low-voltage cutoff.
• First-shift preparation on the HT660: After installing this pack, place the scanner in its cradle for a full charge cycle before using it in pick-and-pack. The scan trigger inrush current is highest when the cell is near minimum, and a pre-charged cell prevents false BMS trips on the first shift.

Cradle showing charging error on a new pack

Charging errors on a new pack are almost always a contact resistance issue, not a cell fault. The HT660 cradle reads pack state through gold-plated dock contacts — if those contacts have oxidation or debris, the dock may flag the pack as unresponsive. Wipe the battery contact strip and the cradle contacts with a dry cloth, then reseat the scanner firmly. If the error clears, the cell was fine — the dock connection was the problem.

Scanner losing wireless connection during rapid scan bursts

The HT660 pulls current simultaneously from the scan trigger and the wireless radio during a fast-burst scanning session. If the cell voltage sags under that combined draw, the radio subsystem drops its connection before the scanner throws a low-battery warning. A fresh, fully charged pack reduces that voltage sag significantly. If drop-outs persist on a charged pack, check wireless polling frequency in the device settings — tighter polling intervals compound the draw.