About this replacement
Datalogic QBT2131 / QBT2400 Series — 3.7V Li-ion Replacement Battery
This 3.7V, 1600mAh Li-ion cell replaces the factory battery in the Datalogic QBT2131, QBT2400, QBT2430, and QM2400 wireless barcode scanners. These are compact handheld units used in retail, warehouse, and logistics environments. Same voltage, same footprint, direct swap with the original pack.
- QBT2131 / QBT2400 / QBT2430 / QM2400 fit: These models share a common 3.7V power rail, battery bay geometry, and BMS communication protocol — one cell format covers the full group without modification.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the QBT2400 platform. The BMS responded correctly to cutoff thresholds, and the scanner's scan-trigger inrush caused no false protection trips across repeated test cycles.
- First-shift preparation: After installing this pack, place the scanner in its charging cradle and run a full charge cycle before picking it up for use. The scan trigger draws its highest inrush current when the cell is near minimum — a fully charged cell prevents false BMS trips at the start of the first shift.
Why the QBT2131 drops wireless connection during rapid scan bursts
The QBT2131 runs its Bluetooth radio and scan imager simultaneously. During a rapid scan burst, both draw current at the same moment — the radio polling cycle and the imager trigger overlap in under a millisecond. On a degraded or low cell, this combined inrush pulls voltage below the BMS hold threshold, briefly cutting the radio stack. The scanner reconnects, but the operator sees it as a lost connection. A fresh, fully charged cell holds voltage stable across both loads simultaneously.
Cradle showing a charging error after fitting this pack
A charging error on the dock immediately after a battery swap almost always comes from contact resistance at the battery terminals, not a fault inside the cell. Oils from handling or debris on the gold contacts raise resistance enough that the cradle's charge controller reads an open circuit and throws the error. Wipe the battery contacts with a dry lint-free cloth, reseat the scanner firmly in the cradle, and confirm the indicator light switches to solid charging. If the dock still errors, check the cradle contacts for corrosion — the cell itself is not the issue.