ONeil 7A100014-1 Andes 3 Replacement Battery 7.4V 2600mAh

ONeil Andes 3 / Apex Series — 7.4V Li-ion Replacement Battery (7A100014-1)

This 7.4V, 2600mAh lithium-ion battery replaces part number 7A100014-1 in ONeil mobile thermal printers. It fits the Andes 3, Apex 2, Apex 2i, and Apex 3i. These are handheld label and receipt printers used in logistics, retail, and field operations where mains power isn't available.

• Andes 3 and Apex series compatibility: These models share the same battery bay dimensions, connector pinout, and 7.4V voltage rail. The BMS handshake protocol is consistent across the series, so one cell fits the full platform without modification.
• Bench tested on actual hardware: We ran this battery through print cycles on an Andes 3 unit. The BMS held stable current delivery through paper feed and thermal head firing sequences. No false low-battery cutoffs during heavy label runs.
• First-deploy print sequence: After installing this battery, charge it fully, then print five test labels before sending the unit into the field. The Andes 3 paper feed motor draws a brief current spike on each cycle — running a calibration sequence confirms the BMS current profile has settled correctly for the new cells.

Why the Andes 3 stops printing after sitting unused for weeks

Lithium-ion cells self-discharge during storage. If an Andes 3 sits unused long enough, the battery voltage can drop below the minimum threshold the printer's motor drive circuit needs to initiate a print job. The printer may power on but refuse to feed or fire the thermal head. Put the unit on charge for at least two hours before attempting any print — the BMS needs to see the cell recover to a stable voltage above 7.0V before it releases current to the motor and head circuits.

Bluetooth drops mid-job on the Apex 2i and Apex 3i

The radio module on the Apex 2i and Apex 3i draws a sharp current spike each time it transmits. When battery charge falls low, voltage sag during that spike can briefly pull the supply below the radio's minimum operating voltage — causing the connection to drop even though the printer still appears powered. This isn't a pairing fault or an app issue. Recharge the battery above 50% and the drops stop. If it happens consistently on a full charge, the cell has degraded and no longer holds the voltage rail steady under combined motor and radio load.