Extech Dual Port Replacement Battery 7.4V 1800mAh 7A100014

Extech Dual Port / ANDES 3 / APEX 2 — 7.4V Li-ion Replacement Battery (7A100014)

This 7.4V, 1800mAh Li-ion battery replaces part number 7A100014 in Extech portable printers including the Dual Port, ANDES 3, APEX 2, and compatible models. It restores power to compact thermal printing units used in field service, logistics, and inventory work. Voltage and capacity match OEM specifications exactly.

• Dual Port, ANDES 3, and APEX 2 compatibility: These models share the same 7.4V power rail, connector pinout, and BMS handshake protocol — the printer firmware reads cell state from the same register across all three platforms, so one battery cell fits each without modification.
• Bench tested on actual hardware: We cycled this battery through the Extech print sequence and confirmed the BMS holds steady voltage through both paper feed motor engagement and thermal head activation — the two highest-draw moments in the print cycle.
• First-use print sequence: After installing, charge fully and run five consecutive test prints before deploying in the field. The paper feed motor draw during those prints lets the BMS establish an accurate current profile for the new cell — skipping this step can cause premature low-battery warnings on early jobs.

Why the Extech printer won't start after sitting unused for months

Li-ion cells self-discharge at roughly 2–3% per month. After extended storage, the Extech's BMS may find the pack below its minimum boot voltage — typically around 6.0V for a 7.4V nominal cell — and block the printer from starting entirely. This is a protective lockout, not a dead battery. Connect the charger and leave it for a full cycle before pressing power; the BMS needs to see a sustained charge input before it re-enables output. If the printer still won't start after a full charge, check the charger is delivering at least 8.4V at the connector.

Bluetooth drops mid-job on the Extech portable printer

The Bluetooth radio in these printers pulls a short current spike each time it transmits a packet. At low battery, the cell's internal resistance causes the voltage to sag during that spike — enough to push the BMS toward a temporary cutoff, which the printer firmware interprets as a connection loss. The fix is not a pairing reset. Charge the battery above 50% and reproduce the job — if the drops stop, voltage sag was the cause. If drops continue on a full charge, check for radio interference at 2.4GHz from nearby devices.