Archos Oxygen 63 Replacement Battery AC630X 3.8V 3000mAh

Archos Oxygen 63 — 3.8V Li-ion Replacement Battery (AC630X)

This is a 3.8V, 3000mAh Li-ion battery for the Archos Oxygen 63 smartphone. It replaces part number AC630X when the original cell degrades, swells, or stops holding charge. Direct swap for the Oxygen 63 — same voltage, same form factor at 90 x 60 x 4.40mm.

• Oxygen 63 fit: The Oxygen 63 uses a fixed 3.8V nominal cell with a matching connector and BMS handshake. This replacement matches that voltage rail and connector pinout so the charge IC and fuel gauge IC communicate correctly from the first boot.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Oxygen 63 platform. The BMS accepted the cell without fault codes, and the charge IC completed a full CC/CV cycle to 4.35V without thermal cutoff.
• Fuel gauge recalibration on first cycle: 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.

Sudden shutdown at 20–30% on the Archos Oxygen 63 after a cell swap

The Oxygen 63 fuel gauge IC retains the discharge curve of the old degraded cell after a swap. When a fresh cell is installed, the coulomb counter's stored curve no longer matches the new cell's actual voltage profile. Under modem or screen load, the phone hits a voltage point the IC interprets as empty — even though capacity remains. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the calibration window and resolves premature cutoffs.

Fast charging not activating on the first cycle after replacement

After a cell replacement, the charge IC on the Oxygen 63 starts in a conservative trickle-charge mode to verify the new cell's impedance before accepting higher current. If the phone shows slow charging on the first cycle, this is the IC running its qualification check — not a fault. Let the first cycle complete at standard rate without interrupting it. Fast charging typically resumes on the second cycle once the IC logs a full charge event against the new cell's internal resistance profile.