About this replacement
Archos AC101OX4G / OXYGEN 4G — 3.7V Li-Polymer Replacement Battery (3097138)
This is a 3.7V, 4400mAh Li-Polymer battery for the Archos AC101OX4G and OXYGEN 4G 10-inch Android tablets. It replaces OEM part numbers 3097138 and 29100145. When the original cell degrades and the tablet no longer holds a charge, this unit restores full power capacity.
- AC101OX4G and OXYGEN 4G compatibility: Both models run the same 3.7V power rail and use the same flex connector and BMS handshake, so a single cell covers both variants without modification.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on the AC101OX4G platform. The BMS accepted charge normally, voltage held steady across the display and WiFi load, and no false-low cutoff events occurred.
- Fuel gauge recalibration after swap: After fitting this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This resets the fuel gauge IC against the new cell's actual capacity curve and eliminates the inaccurate percentage reading that commonly appears after a battery swap.
Why the AC101OX4G shuts down at 15–25% remaining
The tablet's charge IC calibrated its low-voltage cutoff point against the old, degraded cell. With a fresh cell installed, the voltage curve is steeper in the lower range, and the IC triggers shutdown earlier than the displayed percentage suggests. The fix is a full recalibration cycle: discharge the tablet to automatic shutoff, then charge without interruption to 100%. After one complete cycle, the fuel gauge IC maps its cutoff thresholds to the new cell's actual discharge curve and shutdown at false-high percentages stops.
Fast charging unavailable after battery replacement on the OXYGEN 4G
Some users find the fast charge option greyed out or absent in Android settings after fitting a new cell. The charge protocol negotiation between the USB-PD controller and the battery management system requires at least one accepted standard charge cycle to re-establish the handshake. Plug in using the original charger and let the tablet complete one full charge at standard rate without unplugging early. Once that cycle completes, fast charge negotiation resumes normally on subsequent connections.