Extech Dual Port Replacement Battery 7.4V 2600mAh 7A100014

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

This 7.4V 2600mAh Li-ion battery replaces OEM part 7A100014 in Extech field-portable printers including the Dual Port, ANDES 3, APEX 2, and fifteen additional models in the same family. It slots directly into the battery bay with the same connector orientation and BMS handshake profile as the factory cell. Capacity is 2600mAh (19.24Wh) — matched to the product data, not estimated from web sources.

• Cross-model fit — Dual Port, ANDES 3, APEX 2 and beyond: These models share a common 7.4V power rail, identical battery bay dimensions (71.70 × 37.70 × 20.40mm), and the same BMS handshake protocol — which is why one cell covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through charge, standby, and print-load sequences. The BMS held voltage within tolerance across thermal head firing events and paper feed motor draw spikes — no cutoff triggers during normal print cycles.
• First-deploy print sequence: After installing, charge to 100% and run five consecutive test prints before taking the unit into the field. Portable printer paper feed motors draw a short high-current burst on each cycle — this sequence confirms the BMS current profile is correctly calibrated to the new cell before you depend on it during a job.

Why Extech portable printers drop Bluetooth mid-job at partial charge

The radio module in Extech field printers draws from the same 7.4V rail as the thermal head and paper feed motor. When battery voltage sags under combined load — radio transmitting while a print job fires — the radio drops first because the BMS prioritises motor drive current. This shows up as a Bluetooth disconnect or a WiFi timeout at 30–40% indicated charge, not at zero. A cell with degraded capacity reaches that sag threshold earlier in the discharge curve. Keeping the battery above 50% charge during active use eliminates most mid-job radio drops.

Faded or uneven print output on a freshly charged battery

The thermal print head requires a stable voltage to reach consistent firing temperature across each dot row. If a cell's internal resistance has climbed — common in aged or deeply discharged Li-ion — voltage dips during head activation cause row-to-row temperature variation, which shows as faded bands or uneven darkness across the receipt. This is not a head fault and not a paper fault. Check resting cell voltage before blaming the printer: a healthy 7.4V nominal cell should sit above 8.0V immediately after a full charge. If resting voltage reads below 7.8V on a freshly charged pack, the cell is the cause.