Motorola ES85 Barcode Scanner Compatible Battery 3.7V 2200mAh

Motorola ES85 / TC55 / MC36 — 3.7V Li-Polymer Replacement Battery (82-164801-02)

This 3.7V, 2200mAh Li-Polymer cell replaces the original pack in the Motorola ES85, ES85XX, MC36, and TC55 handheld barcode scanners. It matches the OEM voltage rail, connector, and BMS communication profile across all four models. Capacity is rated at 8.14Wh — identical to the factory specification.

• ES85, ES85XX, MC36, and TC55 compatibility: All four models run the same 3.7V single-cell architecture with the same dock-side charging interface. The BMS handshake protocol is shared across this platform, so one cell covers the full group without any firmware conflict.
• Bench tested on actual hardware: We cycled this pack through repeated scan-trigger and wireless polling loads. The BMS held its charge termination voltage at 4.2V and recovered cleanly from a near-depleted state without false protection trips.
• First-shift preparation on the ES85: After installing the new pack, seat the scanner in its charging cradle and run a complete charge cycle before using it on the floor. Scan-trigger inrush current is highest when the cell is close to minimum — a fully charged cell prevents a BMS protection trip during the first burst of picks.

Cradle showing a charging error on a new pack

The TC55 and ES85 docks use spring-loaded gold contacts that accumulate oxidation and debris from daily drops into the cradle. When contact resistance climbs above a few ohms, the dock's charge controller reads a fault and stops the charge cycle. Wipe the four contacts on the battery base and the corresponding pins in the cradle with a dry lint-free cloth before reseating. If the error clears on the next dock insertion, contact resistance was the cause — not a faulty cell.

Scanner dropping wireless connection during rapid scan bursts

The ES85 and TC55 draw from the same cell for both the scan engine and the Wi-Fi or Bluetooth radio simultaneously. During a rapid burst of scans, the combined inrush can pull the cell voltage down momentarily, causing the radio subsystem to reset its connection before the BMS trips the full pack. This appears as a dropped network session rather than a dead scanner. If this happens mid-shift, check the resting voltage — a healthy cell should sit above 3.6V at rest between bursts.