Honeywell Voyager 1602G Replacement Battery 3.7V 850mAh

Honeywell Voyager 1602G / 8650 / 8670 — 3.7V Li-ion Replacement Battery (50129434-001FRE)

This 3.7V 850mAh Li-ion cell replaces the internal battery in the Honeywell Voyager 1602G, 8650, and 8670 handheld barcode scanners. These scanners run in retail, warehouse, and logistics pick-and-pack environments where the battery takes repeated short-cycle punishment across every shift. Capacity matches the OEM pack at 3.15Wh.

• Voyager 1602G, 8650, and 8670 compatibility: All three models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one pack fits the entire group without modification.
• Bench tested on actual hardware: We ran this pack through the Voyager 1602G cradle and triggered continuous scan bursts to stress the BMS. The protection circuit held cutoff thresholds consistent with OEM behaviour — no false low-voltage trips under rapid-fire trigger draws.
• First cradle cycle before field use: After installing this pack, seat the scanner in its cradle and run a full charge cycle before the first shift. Scan trigger inrush current peaks when the cell sits near minimum voltage — a full cell on day one prevents false BMS cutoffs when the pick-and-pack pace is highest.

Cradle showing a charging error on a new pack

The Voyager cradle communicates with the battery pack through spring-loaded dock contacts. If those contacts carry oxidation or residue from a depleted old pack, the dock reads elevated resistance and flags a charging fault even though the new cell is fine. Wipe the gold contacts on both the scanner base and the cradle with a dry lint-free cloth, then reseat firmly. If the error clears within 30 seconds of reseating, contact resistance was the cause — the cell itself is not at fault.

Scanner dropping wireless connection during rapid scan bursts

The 1602G and its siblings draw from the same cell for both the scan imager and the wireless radio simultaneously. During a fast scan burst, combined inrush from the trigger and the radio polling cycle can pull the cell voltage momentarily below the BMS floor, causing the radio stack to drop. This shows up as the scanner going dark mid-session or requiring a trigger re-press to re-establish the link. Keeping the cell charged above 3.5V before a high-tempo shift is the direct fix — check the charge indicator on the cradle before pulling the scanner for use.