Symbol MC36 Barcode Scanner Replacement Battery 3.7V 2200mAh

Symbol MC36 — 3.7V Li-Polymer Replacement Battery

This 3.7V, 2200mAh lithium-polymer battery replaces the original pack in the Symbol MC36 handheld mobile computer. The MC36 is a barcode scanner and data collection device used in retail, warehousing, and logistics. Swap this pack in when the original no longer holds a full charge or fails to power the device through a shift.

• MC36 platform fit: The MC36 uses a slim Li-Polymer cell at 3.7V to keep the housing thin enough for single-hand scanning. The cell dimensions — 93.80 x 55.10 x 5.50mm — match the battery bay exactly, and the contact layout aligns with the MC36 dock connector.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the MC36 platform. The BMS initialised correctly on first dock insertion, accepted a full charge without error flags, and released current cleanly on scan trigger actuation.
• First-shift prep on the MC36: After installing, seat the scanner in its cradle for a complete charge cycle before use. Scan trigger inrush current spikes highest when the cell sits near minimum — a fully charged pack prevents false BMS trips that can lock the scanner on the opening scans of a pick-and-pack shift.

Cradle showing a charging error on a new pack

A new Li-Polymer pack can trigger a charging error on the MC36 cradle when the dock contacts carry residue from the old battery or from warehouse handling. The cradle reads contact resistance as a fault and stops the charge cycle before it starts. Wipe the gold contacts on the battery and on the cradle with a dry cloth, then reseat the scanner firmly. The error clears and charging begins within a few seconds of solid contact.

Scanner losing wireless connection during rapid scan bursts

The MC36 draws simultaneously from the radio module and the scan trigger during a fast scan burst, creating a combined inrush that can sag cell voltage below the BMS hold threshold. When that happens, the wireless stack drops and the scanner pauses to recover — it looks like a signal issue but the cause is electrical. A cell that has degraded even modestly hits the sag threshold sooner, making the dropout more frequent. Starting each shift from a full charge keeps the resting voltage high enough to absorb the combined load without tripping the BMS.