Datamax OC3 Barcode Scanner Replacement Battery 7.4V 2400mAh

Datamax OC3 — 7.4V Li-ion Replacement Battery

This 7.4V, 2400mAh lithium-ion battery fits the Datamax OC3 mobile barcode scanner. The OC3 is a handheld scanner used across retail, warehouse, and logistics environments for barcode capture and wireless data transmission. Capacity is sourced from the product specification — 17.76Wh total energy.

• OC3 platform fit: The OC3 uses a 7.4V two-cell Li-ion pack with a BMS that monitors cell voltage and current draw from both the imager and the wireless radio simultaneously. This replacement matches that voltage rail and connector, so the scanner's power management system recognises the pack without throwing a fault code.
• Bench tested on actual hardware: We cycled this pack through combined scan-trigger and wireless polling loads. The BMS held cutoff thresholds steady across both inrush events without tripping into protective shutdown.
• First-shift preparation for pick-and-pack use: After installing, seat the scanner in its cradle for a full charge cycle before putting it into active picking. Scan-trigger inrush current is highest when the cell is near minimum charge, and starting the shift with a fully charged pack prevents false BMS trips on the first run of labels.

Cradle showing a charging error on a new OC3 battery pack

Charging cradles on the OC3 use spring-loaded dock contacts that can accumulate oxidation or warehouse dust between shifts. A new pack with clean contacts can still trigger a charging fault if the cradle-side pins have debris on them. The dock reads contact resistance as part of its handshake — elevated resistance looks like a pack fault even when the cell is fine. Wipe both the pack contacts and the cradle pins with a dry cloth, reseat firmly, and the charging indicator should clear within 30 seconds.

Scanner losing wireless connection during rapid scan bursts

During rapid scanning, the OC3 draws current simultaneously from the imager and the wireless radio — two separate inrush events in quick succession. If the pack voltage sags under that combined load, the radio subsystem drops its connection before the scanner's main processor notices a power event. This is more likely late in a shift when the cell is below 50% charge. Swap to a fresh pack and confirm the wireless link restores at idle — if it does, the issue is load-induced voltage sag, not a radio fault.