David Clark 9900 Barcode Scanner Replacement Battery 3.7V 1800mAh

David Clark 9900 — 3.7V Li-ion Replacement Battery

This 3.7V, 1800mAh Li-ion battery fits the David Clark 9900 handheld barcode scanner. It slots into the scanner used across retail, warehouse, and inventory environments where continuous scanning shifts demand a fresh power source. Voltage and capacity match the original cell exactly.

• 9900 platform fit: The 9900 scanner runs a single-cell 3.7V Li-ion architecture. This replacement matches that voltage rail and the physical footprint — 64.94 × 36.80 × 11.80mm — so the cell seats correctly against the contact pads without modification.
• Bench tested on actual hardware: We cycled this pack through simulated scan-burst loads, monitoring BMS cutoff thresholds at both the low-voltage floor and the inrush spike that the scan trigger generates. The BMS held cutoff within the expected window throughout.
• First-shift charging tip: After installing, place the scanner in its cradle for a full charge cycle before use. Scan trigger inrush current is highest when the cell is near minimum. A pre-charged cell prevents false BMS trips on the first shift of the day.

Cradle showing a charging error on a new pack

Charging docks on the 9900 read contact resistance before initiating the charge cycle. If the gold contacts on the battery or cradle have oxidation or handling residue, the dock registers a fault and won't start charging. Remove the battery, wipe both sets of contacts with a dry cloth, and reseat the pack firmly. The dock should begin the charge cycle within a few seconds of correct seating.

Scanner losing wireless connection during rapid scan bursts

During a rapid scan sequence, the scanner draws current simultaneously from the imager and the wireless radio. This combined inrush can push a partially depleted cell below the BMS protection floor momentarily, dropping the radio link mid-burst. The fix is to ensure the battery is above 3.5V before starting a high-frequency scan session. If dropouts persist at a charged state, check that the battery contact pins in the grip are clean and making full contact.