Spare 1128 UHF Reader Compatible Battery 3.7V 900mAh Li-ion

Spare 1128 UHF Reader / 1153 — 3.7V Li-ion Replacement Battery

This is a 3.7V 900mAh Li-ion cell for the Spare 1128 UHF Reader and 1153 handheld barcode scanner. It slots into the same battery bay as the original and connects to the same BMS circuitry. Capacity is 900mAh (3.33Wh), matching the stock specification.

• 1128 UHF Reader and 1153 compatibility: Both models share the same 3.7V single-cell architecture, battery bay dimensions, and contact layout. The BMS on each device expects the same voltage curve, so one cell works across both without firmware or hardware changes.
• Bench tested on actual hardware: We ran the cell through full charge-discharge cycles on a 1128 UHF Reader body. The BMS accepted the pack without fault codes, and the protection circuit responded correctly at both low-voltage cutoff and charge termination.
• First-shift prep for pick-and-pack operations: After installing, seat the scanner in its cradle for a full charge cycle before pulling the trigger. Scan trigger inrush current spikes highest when the cell is near minimum charge — a pre-charged cell prevents a false BMS trip on the very first scan burst of the shift.

Cradle showing a charging error on a new pack

Charging docks on UHF handheld scanners detect pack state through spring-loaded contact pins. If those pins carry oxidation or debris from the old battery, resistance rises enough for the dock to flag a fault rather than begin charging. Remove the pack, wipe the gold contacts on both the battery and the dock slot with a dry cloth, then reseat firmly. If the error clears, the cell was fine — the contact surface was the issue.

Scanner drops wireless connection during rapid scan bursts

A 1128 UHF Reader fires both the UHF radio and the scan trigger simultaneously during fast burst scanning. That combined inrush can pull the cell voltage low enough for the radio module to brown out momentarily, dropping the wireless link. This is more likely if the replacement cell ships partially discharged, as all Li-ion cells do. Charge fully to 4.2V before the first use — that eliminates the voltage sag window where the radio loses power.