Motorola ES85 Barcode Scanner Replacement Battery 3.7V 4400mAh

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

This 3.7V, 4400mAh Li-ion battery replaces the original pack in the Motorola ES85, ES85XX, MC36, and TC55 handheld barcode scanners. It matches the OEM cell format, connector, and BMS communication protocol for those platforms. Capacity is sourced from the product specification — 4400mAh (16.28Wh).

• ES85, ES85XX, MC36, and TC55 compatibility: These four scanner platforms share the same battery bay geometry, 3.7V nominal rail, and BMS handshake protocol. One cell format covers all four without adapter or firmware changes.
• Bench tested on actual hardware: We ran this pack through charge and scan-trigger cycles on the TC55 and ES85. The BMS accepted the charge profile from both a Motorola cradle and a direct USB charge source, and the protection circuit responded correctly to simulated over-discharge events.
• First-shift prep for pick-and-pack operations: After installing the new pack, seat the scanner in its cradle and run a full charge cycle before the shift begins. Scan trigger inrush current peaks when the cell is near minimum — a pre-charged pack prevents false BMS trips during the first high-frequency scan burst of the day.

Cradle showing charging error on a new pack

Motorola charging cradles use contact resistance to verify a valid pack before initiating the charge cycle. Oxidation or debris on the battery's gold contacts raises resistance above the cradle's detection threshold and triggers an error flag — even with a fully functional cell inside. Remove the pack, wipe all five contacts on both the battery and the cradle dock with a dry lint-free cloth, then reseat firmly until the latch clicks. The cradle should clear the error and begin charging within 10 seconds of a clean reseat.

Scanner losing wireless connection during rapid scan bursts

The ES85 and TC55 run both the wireless radio and the scan imager from the same cell simultaneously. During a rapid burst of scans, the combined inrush from the imager trigger and the Wi-Fi polling cycle can cause a momentary voltage sag that drops the radio below its minimum operating threshold. This drops the wireless session mid-scan without any obvious error on screen. If this happens repeatedly, check that the cell is above 3.5V before the shift — a cell sitting at 3.4V or lower will sag under combined draw and disconnect the radio before the BMS trips the pack entirely.