Unitech HT850 Barcode Scanner Replacement Battery 3.7V 800mAh

Unitech HT850 / HT580 — 3.7V Li-ion Replacement Battery (2095047)

This 3.7V 800mAh Li-ion battery fits the Unitech HT850 and HT580 handheld barcode scanners. Both are compact mobile data terminals used in retail, logistics, and warehouse environments for barcode capture and data entry. It matches OEM part numbers 2095047 and 1400-202536G.

• HT850 and HT580 compatibility: Both models share the same battery bay dimensions, 3.7V power rail, and connector pinout. The BMS handshake protocol is identical across the HT850 and HT580, so one cell fits both without modification.
• Bench tested on actual hardware: We ran this pack on the HT850 platform and confirmed the BMS accepted the cell without a fault code. Scan trigger inrush and wireless polling drew simultaneous current without tripping the protection circuit.
• First-shift prep for pick-and-pack: After installing, place the scanner in its cradle for a full charge cycle before starting a shift. Scan trigger inrush is highest when the cell is near minimum, and a fully charged pack prevents false BMS trips on the first burst of scanning.

Cradle showing a charging error on a new pack

A charging error on the dock immediately after fitting a new cell usually points to contact resistance at the battery terminals, not a faulty pack. Debris or oxidation on the gold-plated contacts breaks the low-voltage handshake the cradle uses to verify cell chemistry before starting the charge cycle. Wipe the battery contacts and the cradle's spring pins with a dry cloth, then reseat the scanner firmly until you hear the click. The error clears once contact resistance drops below the dock's threshold and the handshake completes.

Scanner losing wireless connection during a rapid scan burst

When the imager fires and the wireless radio transmits simultaneously, peak current draw spikes sharply in a short window. On a degraded or deeply discharged cell, this combined inrush pulls the cell voltage below the BMS cutoff, which briefly kills the radio stack before the cell recovers. The result looks like a dropped connection rather than a power fault, so it is easy to misdiagnose as a Wi-Fi issue. Charge the pack to full — at least 4.1V open-circuit — before the shift so the cell has enough headroom to handle both loads at once.