Green Orange N2 QCSHA12 Replacement Battery 3.8V 3000mAh

Green Orange N2 / JL610 — 3.8V Li-Polymer Replacement Battery (QCSHA12)

This is a 3.8V, 3000mAh (11.4Wh) Li-Polymer battery for the Green Orange N2 and JL610 smartphones. It replaces OEM part number QCSHA12 in devices where the original cell has degraded, swollen, or failed. It restores power to the processor, display, and radio stack without replacing the handset.

• N2 and JL610 compatibility: Both models share the QCSHA12 connector pinout, cell voltage rail, and BMS handshake protocol. The same 3.8V nominal cell fits either device without modification to the charging circuit or power management IC.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on N2 hardware. The BMS accepted the charge handshake on first cycle, protection circuits responded correctly to overcurrent conditions, and the cell held within 3% of rated capacity at the 3000mAh mark.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — which causes the percentage jumps many users report immediately after a swap.

Sudden shutdown at 20–30% on the QCSHA12 replacement cell

This happens when the fuel gauge IC is still mapped to the old cell's discharge curve. The N2's power management IC uses a coulomb counter, but that counter was calibrated to a degraded cell with a steeper voltage cliff. The new cell holds voltage well until the modem fires a high-draw burst — at which point the gauge reads a collapse it didn't expect and triggers an emergency shutdown. One full discharge down to automatic shutoff, followed by a full charge without interruption, resets the curve.

USB fast charge not activating on the first cycle after replacement

The N2 charge IC runs a handshake with the BMS before enabling fast charge current. On a fresh cell, the BMS may respond outside the expected timing window on that first cycle, causing the charge IC to fall back to standard 5V input. This is not a fault — it clears after the cell completes one slow charge cycle and the BMS logs a full state-of-charge reading. If fast charge still does not activate after the second cycle, check that the cable supports the required current rating for the handset's proprietary protocol.