About this replacement
Hoft & Wessel HW 19270 / allegro LSi — 3.7V Li-ion Replacement Battery (T39300)
This 3.7V, 3800mAh Li-ion battery replaces the original T39300 pack in the Hoft & Wessel HW 19270 and allegro LSi handheld barcode scanners. These units run in retail and warehouse environments where the scanner stays active across full shifts. Swap this in when the original cell no longer holds enough charge to complete a working day.
- HW 19270 and allegro LSi compatibility: Both models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one pack covers both. The T39300 part number spans this platform without modification.
- Bench tested on actual hardware: We ran the pack through charge and discharge cycles on a compatible unit. The BMS responded correctly to both cradle charging and trigger-pull inrush events, with no false cutoffs observed at any state of charge.
- First-shift preparation for pick-and-pack use: Place the scanner in its cradle for a full charge cycle before the first shift. Scan trigger inrush current is highest when the cell is near minimum voltage, and a fully charged pack prevents the BMS from tripping during the first burst of high-frequency scanning.
Cradle showing a charging error on a new T39300 pack
Some HW 19270 cradles flag a charging fault when contact resistance at the dock pins rises above the threshold the charging circuit expects. This is a contact issue, not a pack fault. The dock pins and the gold contacts on the battery face oxidise over time, especially in dusty warehouse environments. Wipe both surfaces with a dry cloth, reseat the scanner firmly, and the error clears — charging should resume within 30 seconds.
Scanner losing wireless connection during rapid scan bursts
During rapid scan sequences, the scanner draws current simultaneously from the imager and the wireless radio. That combined inrush can cause a momentary voltage sag across the cell. If the cell voltage dips below approximately 3.2V under that combined load, the BMS may briefly interrupt output, which the radio interprets as a dropout. A fresh, fully charged T39300 pack holds voltage under this dual draw far better than a degraded original cell — seat the scanner in the cradle until the charge indicator confirms 100% before a high-frequency scanning shift.