Leuze IT 1452 Replacement Battery 3.7V 2000mAh Li-ion

Leuze IT 1452 / IT 3820 Series — 3.7V Li-ion Replacement Battery (50105384)

This 3.7V 2000mAh Li-ion cell replaces OEM part 50105384 in Leuze handheld barcode scanners. It fits the IT 1452, IT 1902G, IT 3820, and IT 4820 models — all of which share the same voltage rail and connector footprint. Capacity is 2000mAh (7.4Wh), matching the original specification.

• IT 1452, IT 1902G, IT 3820, IT 4820 compatibility: These four models share a common 3.7V single-cell architecture and the same BMS handshake protocol. One pack covers the full range without modification.
• Bench tested on actual hardware: We cycled this pack through repeated scan-trigger bursts and monitored the BMS under combined wireless polling and laser firing loads. Voltage held steady and the protection circuit did not trip during simulated pick-and-pack duty.
• First-shift preparation: After installing, seat the scanner in its cradle and let it complete a full charge cycle before starting work. Scan trigger inrush current peaks when the cell is near minimum voltage — a fully charged pack on the first shift prevents the BMS from cutting out under that initial load spike.

Cradle showing a charging error on a new pack

Charging docks on the IT series read pack state through a set of contact pins on the battery's base. If those contacts are oxidised or carry residue from shipping, the dock registers a handshake fault and stops charging. Wipe the battery contacts and the dock contacts with a dry cloth, then reseat the pack firmly. The error clears immediately once contact resistance drops below the dock's threshold — no reset or firmware step required.

Scanner dropping wireless connection during rapid scan bursts

The IT 3820 and IT 4820 draw from the same cell for both the wireless radio and the scan trigger simultaneously. During rapid bursts, this combined inrush can sag cell voltage enough to momentarily starve the radio module, causing the connection to drop mid-session. This happens more often when the battery is below 30% charge. Keep the pack above that threshold during high-frequency scanning, or rotate to a freshly charged unit when the battery indicator reaches one bar.