Symbol MC3100 Barcode Scanner 82-127912-01 Replacement Battery 3.7V 6800mAh

Symbol MC3100 / MC3190 Series — 3.7V Li-ion Replacement Battery (82-127912-01)

This 3.7V 6800mAh Li-ion battery replaces OEM part 82-127912-01 and BTRY-MC3XKABOE in Symbol MC3100 and MC3190 series handheld barcode scanners. It fits the MC3190, MC3190G, and MC3190-G13H02E0 among others. The 25.16Wh cell capacity matches the original pack specification for warehouse and retail scanning environments.

• MC3100 / MC3190 platform fit: These models share a common battery bay, connector pinout, and BMS handshake protocol across the MC31xx and MC319x lines. The same 3.7V cell architecture powers the imager, wireless radio, and scan trigger from a single pack, so one replacement covers the full model range listed.
• Bench tested on actual hardware: We cycled this pack through repeated scan-burst sequences — rapid trigger pulls combined with active 802.11 wireless polling. The BMS held stable across both inrush events without tripping into protection mode, and cell voltage recovery between bursts stayed within the expected window.
• First-shift cradle protocol: After installing this pack, seat the scanner in its cradle and run a full charge cycle before taking it onto the floor. Scan trigger inrush current is highest when the cell is near its minimum, and a pre-charged cell prevents false BMS cutoffs on the opening shift of a new battery.

Cradle showing a charging error on a new pack

The MC3100 cradle communicates with the battery's BMS through gold contact pads on the base of the scanner. If those pads have oxidation, debris, or residue from a previous pack, the dock reads elevated contact resistance and flags a charging fault — not a cell fault. Wipe the contacts on both the battery and the cradle insert with a dry cloth before reseating. If the error clears after reseating, the contacts were the issue. If the fault persists after two reseats with clean contacts, check that the cradle firmware supports the 6800mAh capacity rating.

Scanner losing wireless connection during rapid scan bursts

During a fast scan sequence, the imager trigger and the 802.11 radio fire simultaneously — both drawing current in the same millisecond window. On a cell that is below 3.5V, this combined inrush can pull pack voltage low enough that the BMS briefly interrupts output, dropping the radio connection mid-burst. The scanner reconnects within seconds, but the break disrupts any active transaction. Keeping the cell above 3.6V before starting a high-volume pick run eliminates this behaviour — charge to full before shifts with heavy scan density.