About this replacement
Acer Iconia Tab W3-810 — 3.7V Li-Polymer Replacement Battery (AP13G3N)
This 3.7V, 6800mAh Li-Polymer battery replaces the original AP13G3N (also cross-referenced as KT.00203.005) in the Acer Iconia Tab W3 and W3-810 Windows tablet. It powers the display, Intel Atom processor, and wireless radios. Dimensions are 134.60 × 103.98 × 4.58mm — measure your existing cell before fitting if you are unsure of your variant.
- W3 and W3-810 compatibility: Both the base Iconia Tab W3 and the W3-810 sub-model use the same connector pinout, cell voltage, and BMS communication protocol. The AP13G3N part number covers both. ZEIV4 is an internal board designation tied to the same battery bay.
- Bench tested on actual hardware: We cycled this cell through a full charge and discharge on a W3-810 unit. The BMS handshake completed without error flags, charge acceptance reached the full 6800mAh range, and the Windows battery driver reported state-of-charge correctly after one calibration cycle.
- Fuel gauge recalibration after install: After fitting this battery, run the tablet down to automatic shutoff — do not force-power-off — then charge it uninterrupted to 100%. This single cycle resets the fuel gauge IC against the new cell capacity and clears the inaccurate percentage readings that commonly appear immediately after a swap.
Iconia Tab W3 shutting down at 15–25% remaining
The W3-810 runs an Intel Atom Z2760 alongside a 1280×800 IPS display and dual-band Wi-Fi simultaneously. Under that combined load, cell voltage drops faster than the fuel gauge IC updates. The tablet's firmware interprets the voltage cliff as a critically low state and triggers a forced shutdown — even though the gauge still shows 15–25%. Fitting a new cell reduces internal resistance, which flattens that voltage curve. Run one full discharge-to-shutoff cycle after installation to let the fuel gauge relearn the new cell's discharge profile.
Windows reporting the new battery as 0% immediately after fitting
This happens when the fuel gauge IC retains calibration data from the degraded original cell and has no valid reference point for the new one. Windows reads the raw register value, sees no matching charge history, and displays 0% or "plugged in, not charging" even with the charger connected. It is not a faulty battery. Connect the OEM 12V charger, leave it undisturbed until Windows reports 100%, then discharge fully to automatic shutoff — this two-step sequence writes a new baseline to the fuel gauge IC and resolves the readout.