About this replacement
Alcatel OT-8085 / One Touch Plus 10" — 3.85V Li-Polymer Replacement Battery (TLp058AC)
This is a 3.85V, 5700mAh (21.95Wh) Li-Polymer cell that replaces the TLp058AC battery in the Alcatel OT-8085 and One Touch Plus 10" tablets. It fits the original battery bay and connects to the existing charge controller without modification. Swap it in when the original cell no longer holds enough charge to get through a normal session.
- OT-8085 and One Touch Plus 10" compatibility: Both models share the same 3.85V power rail, connector pinout, and BMS handshake protocol — that's why a single TLp058AC cell serves both. The charge IC on each tablet reads cell voltage and temperature data from the same register set, so no firmware adjustment is needed after installation.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the OT-8085 platform and confirmed the BMS accepted the new cell without fault codes, balanced charge termination triggered correctly at 4.35V, and discharge cutoff engaged at the expected low-voltage threshold.
- Fuel gauge reset after swap: After installing this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell's actual capacity curve and clears the inaccurate percentage readings that typically appear in the first few cycles after a swap.
Tablet shutting down at 15–25% remaining after battery replacement
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. The tablet acts on that stale data and cuts power before the new cell is actually depleted. The shutdown typically happens under combined load — display at full brightness plus active Wi-Fi — because that load spike causes a voltage dip that crosses the old cutoff threshold. One full discharge-to-shutoff followed by an uninterrupted charge to 100% resets the calibration, and the shutdowns stop.
Fast charging not available after fitting a new TLp058AC cell
The One Touch Plus 10" uses a USB-PD negotiation sequence to enable fast charge mode — and that negotiation resets after a battery swap. Until the charge IC completes one full accepted charge cycle with the new cell, it defaults to standard 5V charging. Plug in the original charger and let it run from low battery to 100% without interruption. After that first complete cycle, fast charge negotiation resumes at the correct voltage.