Symbol LS3478 Barcode Scanner Replacement Battery 3.7V 3400mAh

Symbol LS3478 / LS3578 Series — 3.7V Li-ion Replacement Battery (BTRY-LS34IAB00-00)

This 3.7V 3400mAh Li-ion battery replaces the original pack in Symbol LS3478, DS3478, LS3578, and DS3578 handheld barcode scanners. It fits the same battery bay and uses the same connector and BMS handshake as the factory cell. Capacity is drawn from product data — 3400mAh / 12.58Wh.

• LS3478 / DS3478 / LS3578 / DS3578 platform fit: These four models share a common battery bay geometry, connector pinout, and BMS communication protocol — which is why one pack covers all of them. Swapping between cordless and corded variants of the same series does not change the battery spec.
• Bench tested on actual hardware: We ran this pack on an LS3478 unit and cycled it through repeated scan bursts at the trigger. The BMS held stable voltage through sustained rapid scanning and did not trip on inrush from the imager or the wireless radio. Charge acceptance matched the cradle's charge curve without fault flags.
• First-shift charge protocol: After installing, seat the scanner in its cradle and let it complete a full charge cycle before use on the floor. Scan trigger inrush current is highest when the cell is near minimum — a fully charged cell prevents false BMS trips at the start of a pick-and-pack shift.

Cradle showing charging error on a new pack

The LS3478 cradle reads the battery through gold contact pads on the base of the scanner. If those pads are oxidised or have residue from a previous pack, the cradle sees elevated contact resistance and throws a charge fault — even with a fully functional new cell. Wipe the contacts on both the battery and the cradle with a dry cloth before seating the scanner. If the error persists, reseat the pack firmly and check the cradle's indicator — a solid amber light confirms charge has started. The fault clears once contact resistance drops below the cradle's threshold.

Scanner losing wireless connection during rapid scan bursts

The LS3478 draws from the same cell for both the imager and the wireless radio. During rapid scan bursts, combined inrush from both subsystems causes a short voltage sag on the battery rail. If the cell is aged or partially discharged, that sag drops the radio below its minimum operating voltage — cutting the wireless link mid-session. This is not a radio fault or a pairing issue. Install a fresh, fully charged pack and check that resting cell voltage reads 3.7V or above before starting a high-frequency scanning session.