About this replacement
Motorola MC2100 / MC2180 — 3.7V Li-Polymer Replacement Battery (82-105612-01)
This is a 3.7V, 1800mAh Li-Polymer replacement battery for the Motorola MC21 series handheld barcode scanner. It fits the MC21, MC2100, and MC2180 models and matches OEM part numbers 82-105612-01, BTRY-MC21EAB0E, and 82-150612-01. The battery slots directly into the MC21 battery bay and connects to the BMS handshake the scanner expects on power-up.
- MC21, MC2100, MC2180 platform fit: These three models share the same battery bay geometry, connector pinout, and BMS communication protocol. The scanner's firmware reads cell voltage and pack ID from the same register across all three variants, so one battery covers the entire MC21 family.
- Bench tested on actual hardware: We cycled this pack through the MC2100 scan-and-transmit loop — trigger bursts combined with active Wi-Fi polling. The BMS held voltage above the 3.2V cutoff threshold throughout and reported pack status correctly to the scanner's battery indicator.
- First-shift cradle protocol: After installing, place the scanner in its cradle for a full charge cycle before using it in pick-and-pack. Scan trigger inrush current is highest when the cell is near minimum, and a pre-charged cell prevents false BMS trips during the first shift.
Cradle showing a charging error on a new pack
The MC21 charging cradle reads pack voltage through the battery contacts before it starts a charge cycle. If those contacts carry oxidation or debris from handling, the cradle sees high contact resistance and flags a fault instead of charging. This is not a bad battery — it is a contact issue. Wipe the gold contacts on the battery and the cradle bay with a dry cloth, reseat the pack firmly, and the charge indicator should switch to solid amber within 30 seconds.
Scanner losing wireless connection during a rapid scan burst
On the MC21, the scan trigger and the Wi-Fi radio pull current at the same time during a continuous scan burst. If the cell voltage sags below roughly 3.3V under that combined load, the radio drops its association before the BMS trips the pack. The fix is a full charge before the shift, not a battery swap. If the drop-outs persist on a fully charged pack, check that the Wi-Fi channel is not congested — the MC2100 holds association longer on a less-loaded 2.4GHz channel.