Xenon 50121527-004 Barcode Scanner Replacement Battery 3.7V 2000mAh

Xenon 50121527-004 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 2000mAh Li-ion battery pack carrying OEM part number 50121527-004. It fits Xenon barcode scanners that originally shipped with that pack. Voltage and capacity match the original cell exactly.

• Xenon scanner platform fit: Xenon handheld scanners share a common voltage rail and connector spec across several models — this pack slots into any unit that takes the 50121527-004. The BMS handshake is the same across the line, so the dock and scanner firmware recognise the pack without throwing a fault code.
• Bench tested on actual hardware: We cycled this pack through full charge, then triggered rapid scan bursts while monitoring BMS cutoff thresholds. The cell held voltage through combined imager and wireless inrush without triggering a premature low-cell trip.
• First-shift preparation: After installing, seat the scanner in its cradle and run a full charge cycle before using it in pick-and-pack. Scan trigger inrush current peaks when the cell is near minimum voltage — a pre-charged pack prevents the BMS from tripping on the very first scan burst of a new shift.

Cradle showing a charging error on a brand-new pack

A charging error on a new pack almost always comes down to contact resistance at the dock, not a fault inside the cell. The cradle uses spring-loaded contacts, and any oxidation or debris between those contacts and the pack terminals raises resistance enough to trigger the dock's charge fault circuit. Wipe the gold contacts on both the pack and the cradle with a dry cloth, reseat the scanner firmly, and watch for the charge indicator to switch from error to active. If the error clears, run the pack to a full charge before returning it to service.

Scanner losing wireless connection during rapid scan bursts

During a fast scan burst, the imager fires while the wireless radio is actively polling — both draw from the cell at the same time. If the pack's state of charge is already low, the combined inrush pulls cell voltage below the BMS floor, causing a momentary power drop that drops the wireless link before the BMS fully trips. The scanner may reconnect within seconds, but the session data for those scans can be lost. Keep the pack above 30% state of charge during high-frequency scanning shifts — the dock's battery indicator turns amber at roughly 3.5V, which is your cue to swap or recharge.