Intermec CK1 Compatible Battery 73659 3.7V 1800mAh

Intermec CK1 / CN1 — 3.7V Li-ion Replacement Battery (73659)

This 3.7V 1800mAh Li-ion battery replaces the original pack in the Intermec CK1 and CN1 mobile computers. These rugged handheld barcode scanners are built for inventory management, asset tracking, and warehouse data collection. This pack matches the OEM voltage, form factor, and BMS handshake requirements for both models.

• CK1 and CN1 compatibility: Both models share the same battery bay dimensions, 3.7V power rail, and connector pinout. The BMS handshake protocol is identical across the two, so one pack covers either unit without modification.
• Bench tested on actual hardware: We ran this pack on a CK1 unit and monitored BMS behaviour through scan trigger bursts and active wireless polling. The cell held voltage above the BMS low-cutoff threshold consistently through high-frequency scan cycles.
• First-shift preparation: After installing, seat the scanner in its cradle and run a full charge cycle before the first shift. Scan trigger inrush current is highest when the cell sits near minimum state of charge — a fully charged cell prevents false BMS trips when the laser or imager fires on the first pick-and-pack round.

Cradle showing a charging error on a new pack

Charging errors on a new pack are almost always contact resistance at the dock, not a fault in the battery itself. Oxidation or debris on the cradle contacts increases resistance enough that the dock misreads the pack's charge state and throws an error. Wipe the gold contacts on both the battery and the cradle with a dry cloth, then reseat the pack firmly. If the error clears, the contact surface was the issue — not the cell.

Scanner losing wireless connection during rapid scan bursts

The CK1 draws simultaneously from the wireless radio and the imager during fast scan sequences. When the cell voltage sags under that combined inrush, the radio module drops out before the BMS cuts off — the scanner appears to freeze or disconnect mid-burst. This is more pronounced when the pack is below 50% state of charge. Keep the pack above 3.6V under load to maintain stable radio output during high-frequency scanning.