About this replacement
Intermec CN50 / CN51 — 3.7V Li-ion Replacement Battery (318-039-001)
This 3.7V 4600mAh Li-ion battery replaces the OEM pack in the Intermec CN50 and CN51 handheld mobile computers. These units are used for barcode scanning, inventory data collection, and wireless stock management in retail and warehouse environments. Voltage and capacity match the original specification exactly.
- CN50 and CN51 compatibility: Both models share the same battery bay geometry, connector pinout, and BMS handshake protocol. A single cell pack covers either unit — no adapter or wiring change needed.
- Bench tested on actual hardware: We cycled this pack through scan-trigger inrush and active Wi-Fi polling simultaneously. The BMS held stable across repeated burst events without tripping into protection mode.
- First-shift preparation: After installing, seat the scanner in its cradle and run a full charge cycle before the first pick-and-pack shift. Scan trigger inrush is highest when the cell is near minimum voltage — a fully charged pack prevents false BMS protection trips during the first hour of heavy scanning.
Cradle showing a charging error on a new pack
The CN50 cradle reads battery state through gold pogo contacts on the base of the scanner. If any contact has oxidation or warehouse dust on it, the dock reports a fault even though the pack itself is fine. Wipe both the cradle contacts and the battery terminals with a dry cloth, reseat the scanner, and the charging indicator should clear within 30 seconds. If the error persists across two reseat attempts, check that the cradle firmware is current — older dock firmware can misread the voltage handshake from a fresh cell reporting full capacity.
Scanner losing wireless connection during rapid scan bursts
The CN50 draws from the battery for both the imager and the Wi-Fi radio simultaneously during a scan burst. When the cell is partially depleted, combined inrush from the scan trigger and radio transmit pulse can cause momentary voltage sag, and the radio drops its association with the access point. This appears as a freeze or missed scan rather than an obvious disconnect. Keep the battery above 30% charge during high-throughput shifts — at that level, the cell's internal resistance is low enough to supply both loads without the voltage rail dipping below the radio's minimum operating threshold of approximately 3.2V.