Honeywell SP5600 Replacement Battery 3.7V 1800mAh Li-ion

Honeywell SP5600 / SP5600 Optimus R — 3.7V Li-ion Replacement Battery

This 3.7V, 1800mAh Li-ion battery replaces the original pack in the Honeywell SP5600 and SP5600 Optimus R handheld barcode scanners. These units are common in retail, warehousing, and logistics environments where scanners run full shifts across pick-and-pack and inventory tasks. Capacity figure is 6.66Wh as rated by the manufacturer.

• SP5600 and SP5600 Optimus R fit: Both models share the same 3.7V battery bay, connector pinout, and BMS communication protocol — one pack covers either unit without modification.
• Bench tested on actual hardware: We cycled this pack through repeated scan-trigger and wireless polling loads. The BMS held stable under combined radio and imager inrush, with no false cutoffs during burst scanning sequences.
• First-shift prep for pick-and-pack use: After installing the new pack, seat the scanner in its cradle and complete a full charge cycle before the shift starts. Scan-trigger inrush current spikes highest when the cell is near minimum voltage — a fully charged cell prevents the BMS from tripping on the very first heavy scan burst.

Cradle showing a charging error on a new pack

Charging docks on the SP5600 series use pogo-pin contacts that corrode or accumulate debris over time. When contact resistance rises past a threshold, the dock's charge controller reads an abnormal voltage drop and flags an error — even with a fully functional new pack installed. Wipe the gold contacts on the battery and the dock pins with a dry cloth, then reseat the scanner firmly. If the error clears within 30 seconds, contact resistance was the cause and no further action is needed.

Scanner losing wireless connection during rapid scan bursts

Rapid back-to-back scans combine imager power draw and wireless radio transmission at the same moment, creating a combined inrush that briefly sags the cell voltage. If the pack is already partially depleted, that sag can cross the BMS's low-voltage threshold and momentarily cut power to the radio module — dropping the wireless link mid-session. This is not a faulty battery; it is the BMS protecting the cell at low state-of-charge. Start each shift with a full charge and keep the pack above 3.5V under load to avoid the sag tripping the cutoff.