About this replacement
Archos 70 Oxygen — 3.8V Li-Polymer Replacement Battery (298292)
This 3.8V, 3000mAh Li-Polymer battery replaces OEM part 298292 in the Archos 70 Oxygen tablet (AC70OX and AC70OXV2). It fits the 7-inch Android tablet directly, restoring untethered operation when the original cell has degraded. Capacity is 11.4Wh — matching the factory specification.
- AC70OX and AC70OXV2 compatibility: Both board revisions share the same 3.8V rail, connector footprint, and BMS handshake protocol, so a single cell covers the full 70 Oxygen lineup without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the AC70OX board. The BMS accepted the cell without error flags, charge current ramped correctly through CC/CV stages, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
- Post-installation calibration step: After fitting this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100% without using the device. This resets the fuel gauge IC calibration against the new cell and clears the inaccurate percentage readings that typically appear after a swap.
Archos 70 Oxygen shutting down at 15–25% remaining
This happens because the fuel gauge IC is still calibrated to the old cell's voltage-curve profile. A new cell holds a steeper voltage slope at low charge levels, so the tablet hits the hardware shutdown threshold before the OS percentage counter reaches zero. It is not a defect in the replacement battery. Run one complete discharge cycle to automatic shutoff, then a full uninterrupted charge — the gauge will re-map its cutoff point to the new cell's actual 3.0V floor.
Fast charging not available after battery swap on the 70 Oxygen
The Archos 70 Oxygen charge IC negotiates fast-charge parameters during the first accepted charge cycle on a new cell. Until that cycle completes, the controller defaults to standard 5V charging as a safety measure. Plug into the original charger and allow a full uninterrupted charge from near-zero to 100%. After that single cycle, the charge IC registers the new cell's internal resistance and re-enables the higher current profile.