M3 Mobile BK10 Replacement Battery 3.7V 3600mAh Li-Polymer

M3 Mobile BK10 — 3.7V Li-Polymer Replacement Battery (BK10-BATT-S34)

This is a 3.7V, 3600mAh Li-Polymer battery built to replace the OEM pack in the M3 Mobile BK10 handheld barcode scanner. The BK10 is used in retail, warehouse, and logistics environments where scanners run through full shifts without returning to a desk. Swapping this pack restores full operating capacity when the original cell has degraded.

• BK10 platform fit: The BK10 uses a single-cell Li-Polymer architecture at 3.7V nominal with a proprietary form factor measuring 73.20 × 59.50 × 15.50mm. This replacement matches that footprint and voltage rail so the onboard BMS reads the pack correctly without throwing a fault code on insertion.
• Bench tested on actual hardware: We cycled this pack through simulated scan-burst loads — repeated trigger pulls combined with active wireless polling — and confirmed the BMS held voltage without tripping on the combined inrush. Capacity measured consistently at rated output across multiple discharge cycles.
• First-shift preparation: After installing, 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, and a fully charged pack prevents false BMS cutoff events during the highest-demand part of the first shift.

Cradle showing a charging error on a new BK10 pack

Charging errors on a new pack are almost always a contact resistance issue, not a fault with the cell itself. The BK10 cradle reads pack state through the charge contacts, and even a small film of contamination raises resistance enough to trigger an error flag. Wipe the gold contacts on both the battery and the cradle with a dry cloth, then reseat the pack firmly until it clicks. If the error clears within 30 seconds of reseating, contact resistance was the cause — not the cell.

Scanner drops wireless connection during rapid barcode scan bursts

The BK10 pulls current from two sources simultaneously during a rapid scan burst — the imager or laser module and the wireless radio maintaining its network link. When the cell voltage sags under that combined load, the radio subsystem can lose enough power to drop its connection before the BMS trips the battery entirely. This is more pronounced in a partially depleted pack. Keep the battery above 20% charge during high-throughput scanning sessions and confirm the cell reads at least 3.5V under load before starting a long picking run.