Motorola MC21 Barcode Scanner Replacement Battery 3.7V 1200mAh

Motorola MC2100 / MC2180 — 3.7V Li-Polymer Replacement Battery (82-105612-01)

This 3.7V, 1200mAh lithium-polymer cell replaces the OEM pack in Motorola MC21, MC2100, and MC2180 handheld barcode scanners. These units are standard in retail and warehouse pick-and-pack operations. Cross-references cover OEM part numbers 82-105612-01, BTRY-MC21EAB0E, and 82-150612-01.

• MC21 series fit: The MC21, MC2100, and MC2180 share the same battery bay geometry, 3.7V power rail, and BMS handshake protocol. One cell fits all three variants without modification.
• Bench tested on actual hardware: We ran this pack in an MC2180 cradle and on-device. The BMS cycled correctly through charge and discharge, and the scanner firmware recognised the cell without prompting an error state.
• First-shift cradle protocol: After installing, seat the scanner in its cradle for a full charge cycle before the first pick shift. Scan trigger inrush current peaks when the cell is near minimum charge — a pre-charged pack prevents false BMS trips when the first shift starts heavy.

Cradle showing a charging error on a new pack

A charging error on a freshly installed cell almost always points to contact resistance at the dock, not a fault in the battery itself. Warehouse dust and oxidation build up on the gold contact pads on the base of the scanner and inside the cradle cup. Wipe both sets of contacts with a dry lint-free cloth, reseat the scanner firmly, and the cradle should recognise the pack within 10 seconds. If the error persists, check the cradle contact pins for bending — they need to sit flush to maintain the handshake voltage above 3.0V.

Scanner losing wireless connection during rapid scan bursts

The MC2100 and MC2180 draw simultaneously from the radio module and the scan trigger during a burst sequence. On a degraded or low-charge cell, this combined inrush causes a voltage sag that trips the BMS and briefly drops the wireless link. The scanner may show a disconnected icon or miss ACKs back to the host system. Charge the replacement pack fully before field use — a cell starting above 3.6V handles the combined draw without sagging below the BMS cutoff threshold.