Falcon PT40 PDT Replacement Battery 3.7V 900mAh

Falcon PT40 PDT Series — 3.7V Li-ion Replacement Battery (633808510046)

This 3.7V, 900mAh Li-ion battery fits the Falcon PT40 PDT, PT40, and PT40-100 handheld barcode scanners. These units are common in retail stockrooms, distribution centres, and logistics operations where the scanner runs through full shifts on a single charge. The cell matches OEM dimensions at 52.69 × 37.00 × 7.26mm and slots directly into the original battery bay.

• PT40 series platform fit: The PT40, PT40-100, and PT40 PDT share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell works across all three variants without modification.
• Bench tested on actual hardware: We cycled this cell through scan-trigger inrush events and wireless polling loads. The BMS held cutoff correctly at low-voltage threshold and recovered charge acceptance normally through the cradle.
• Pre-shift charging on the PT40: After installing, place the scanner in its cradle for a full charge cycle before the first pick-and-pack shift. Scan trigger inrush is highest when the cell sits near minimum charge, and starting the shift with a full cell prevents false BMS trips during rapid early-shift scanning.

Cradle charging error on a fresh PT40 pack

The PT40 cradle reads battery state through spring-loaded dock contacts on the base of the scanner. If those contacts have oxidation or debris from warehouse use, the dock reports a charging fault even when the cell is healthy. Wipe the gold contacts on both the battery door and the cradle cup with a dry cloth before reseating. If the error clears after reseating, the cell was never at fault — the contact resistance was high enough to trigger the dock's fault logic.

Scanner dropping wireless connection during rapid scan bursts

On the PT40, the wireless radio and the scan trigger draw current simultaneously during a fast scan sequence. A depleted or degraded cell can't sustain both loads at once — voltage sags below the radio module's minimum and the connection drops mid-burst. This is not a firmware issue. Charge the replacement cell fully before use and confirm resting voltage reads at least 3.6V before the shift starts. A freshly charged cell handles the combined inrush without the sag that kills the radio link.