NEXGO N86 GX05 Replacement Battery 7.4V 3400mAh Li-ion

NEXGO N86 — 7.4V Li-ion Replacement Battery (GX05)

This is a 7.4V, 3400mAh Li-ion battery built to fit the NEXGO N86 portable POS terminal. It replaces the original GX05 cell and restores full power to terminals that no longer hold a charge. The N86 is a compact, Android-based payment terminal used at retail counters, market stalls, and mobile checkout points.

• N86 platform fit: The N86 uses a 7.4V two-cell Li-ion pack with a proprietary connector and BMS handshake. This battery matches that voltage rail and connector pinout. The terminal's charge IC will not negotiate with a mismatched cell configuration, so voltage and connector alignment matter here.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an N86 unit. The BMS responded correctly at both the low-voltage cutoff and the top-off threshold. No overcurrent trips occurred during printer and wireless draw events.
• First deployment on the N86: After fitting this battery, run at least one complete transaction — card tap or swipe, receipt print — before putting the terminal into live service. The N86 maps battery capacity during normal operation and needs one full power cycle to display the charge indicator correctly.

Terminal not completing PCI boot sequence after battery swap

The N86 runs a PCI-compliant boot sequence that checks hardware integrity before loading the payment kernel. On a freshly installed cell, the BMS handshake may not yet be fully accepted by the terminal's charge controller, causing the boot to stall or loop. This is not a fault with the battery itself — it is the terminal verifying that the power source meets its security requirements. Allow the unit to sit on charge for 20–30 minutes after the first power-on, then reboot. The sequence completes once the charge controller has registered the new cell above 7.8V.

Battery indicator stuck at 99% through an entire shift

On a new Li-ion cell, the N86's charge IC enters a top-off phase that holds the display at 99% while it delivers a low trickle current to bring the cell to its exact full-charge voltage of 8.4V. This phase can last longer than expected on a fresh battery because the cell starts with a partial factory charge. The indicator moves to 100% only once the charge current drops below the IC's termination threshold. No action is needed — one full charge cycle from below 20% clears this behaviour permanently.