Datamax OC3 Barcode Scanner Replacement Battery 7.4V 3400mAh

Datamax OC3 — 7.4V Li-ion Replacement Battery

This 7.4V 3400mAh Li-ion pack replaces the original battery in the Datamax OC3 mobile barcode scanner. The OC3 is a handheld data collection device used in warehouse, retail, and logistics environments. Voltage and capacity match the factory spec — no modification needed to fit the battery bay.

• OC3 platform fit: The OC3 battery bay accepts a fixed voltage rail at 7.4V with a specific connector orientation and BMS handshake. This pack matches that configuration — the BMS communicates state-of-charge data back to the scanner's firmware the same way the original does.
• Bench tested on actual hardware: We cycled this pack through scan trigger inrush and active wireless polling simultaneously. The BMS held voltage within spec and did not trip under combined radio-plus-imager draw across repeated rapid bursts.
• First-shift preparation: After installing this pack, seat the OC3 in its charging cradle and run a full charge cycle before pulling it for pick-and-pack work. Scan trigger inrush is highest when the cell is near minimum voltage — a fully charged cell prevents a false BMS cutoff on the first shift.

Cradle showing a charging error on a new pack

A charging error on a brand-new pack almost always comes down to contact resistance at the dock, not a fault in the battery itself. Dust, oxidation, or residue on the gold contacts between the cradle and the battery face block the current signal the dock uses to initiate charge. Wipe the pack contacts and the cradle contacts with a dry cloth, then firmly reseat the scanner. If the error clears within 30 seconds, the contacts were the cause — not the pack.

OC3 losing wireless connection during rapid scan bursts

During a fast scan sequence, the imager and the wireless radio draw current at the same time. If the cell is aged or partially discharged, that combined inrush causes a momentary voltage sag that drops below the radio module's minimum operating threshold — the radio drops, the scanner pauses, and the session breaks. A fresh, fully charged pack sustains voltage through that combined draw. If an older battery causes this repeatedly, check resting voltage with a multimeter — a healthy 7.4V Li-ion cell at rest should read above 7.2V.