KOAMTAC KDC30 Replacement Battery 3.7V 500mAh Li-Polymer

KOAMTAC KDC30 / KDC270 / KDC300 Series — 3.7V Li-Polymer Replacement Battery (KDC-699700)

This 3.7V, 500mAh lithium-polymer cell replaces the original battery in KOAMTAC KDC30, KDC270, KDC280, and KDC300 barcode scanners. At 41.50 × 29.50 × 5.00mm, it fits the compact internal bay without modification. OEM part numbers KDC-699700 and KDC-BAT300 both cross to this pack.

• KDC30 / KDC270 / KDC280 / KDC300 compatibility: These four scanners share the same 3.7V single-cell Li-Polymer architecture, identical battery bay dimensions, and the same BMS handshake protocol over the pack connector — one cell fits all four.
• Bench tested on actual hardware: We cycled this pack through repeated scan-trigger and wireless polling bursts on the KDC30 platform. The BMS held voltage above the scanner's low-battery cutoff threshold throughout the discharge curve without tripping a false shutdown.
• First-shift prep for pick-and-pack use: After installing, seat the scanner in its cradle and run a full charge cycle before the shift starts. Scan-trigger inrush current is highest when the cell is near minimum voltage — a pre-charged cell prevents BMS trips during the first scan burst of the day.

Cradle showing a charging error after fitting a new pack

Charging errors on a fresh pack are almost always a contact resistance issue, not a cell fault. The KDC cradle monitors charge current at the dock contacts — if resistance is high enough, the current reading falls outside the expected window and the dock flags an error. Wipe the gold pads on the battery and the dock contacts with a dry cloth, then reseat the scanner firmly. If the error clears, the contacts were the cause, not the cell.

Scanner drops wireless connection during rapid scan bursts

The KDC30 runs its Bluetooth radio and scan engine simultaneously — during a fast burst, both draw current at the same moment. If the cell voltage sags below the radio's minimum threshold under combined load, the wireless stack resets and the connection drops. This is more likely on a partially discharged cell than a full one. Start each shift with a fully charged pack and the drop rate falls significantly; if it still occurs on a full charge, check that the battery contacts are seated flush in the bay.