HP 4400W Barcode Scanner Replacement Battery 3.7V 2600mAh

HP 4400W — 3.7V Li-ion Replacement Battery

This 3.7V, 2600mAh Li-ion cell is a direct replacement for the HP 4400W handheld barcode scanner. It fits the 4400W's battery compartment and connects through the same contact points as the original pack. Capacity figures are taken from the product specification — 9.62Wh total energy.

• 4400W platform fit: The 4400W runs a single-cell 3.7V Li-ion architecture with a BMS that monitors cell voltage and inrush on the scan trigger circuit. This replacement pack matches that voltage rail and uses a compatible BMS handshake so the scanner powers on and reads without a firmware lockout.
• Bench tested on actual hardware: We cycled this pack through charge, idle, and active scan-trigger draws. The BMS handled the combined radio polling and laser inrush without tripping a false low-voltage cutoff. Cell voltage at full charge measured within the expected 4.2V ceiling.
• First-shift preparation: After installing this pack, seat the scanner in its cradle and complete one full charge cycle before pulling it for active use. Scan trigger inrush is highest when the cell is near minimum — a pre-charged pack prevents the BMS from tripping a protective cutoff during the first pick-and-pack shift.

Cradle showing a charging error on a new pack

Charging docks communicate with the battery pack through metal contact pads on the base of the scanner. If those contacts carry any oxidation, skin oils, or warehouse dust, the dock's charge controller reads elevated contact resistance and flags an error rather than starting a charge cycle. This is not a BMS fault inside the new pack — it's a contact issue. Wipe the gold pads on both the scanner base and the cradle terminals with a dry lint-free cloth, reseat the scanner firmly, and the charge indicator should switch to active within 30 seconds.

Scanner losing wireless connection during a rapid scan burst

The 4400W draws from the same cell simultaneously for the scan trigger and the wireless radio. During a rapid burst of successive scans, the combined inrush pulls the cell voltage down momentarily. If the cell is aged or partially discharged, that voltage sag drops below the radio module's minimum operating threshold and the wireless link drops. The scanner may still trigger the laser but stops transmitting data. Charge the pack above 50% before high-frequency scanning sessions — at that state of charge, the cell's internal resistance is low enough to supply both loads without the sag crossing the radio's cutoff floor.