Lenovo ThinkPad Tablet 2 L12M2P01 Compatible Battery 3.75V 6600mAh

Lenovo ThinkPad Tablet 2 3679 — 3.75V Li-Polymer Replacement Battery (L12M2P01)

This is a 3.75V, 6600mAh Li-Polymer battery for the Lenovo ThinkPad Tablet 2 3679 (10.1-inch), Miix 10, and Z2760. It replaces OEM part numbers L12M2P01, L12N2P01, 121500184, 1ICP4/83/102-2, and 1ICP4/83/103-2. It sits inside the chassis and powers the display, Intel Atom Z2760 processor, and all onboard peripherals.

• ThinkPad Tablet 2 and Miix 10 fitment: These models share the same flat Li-Polymer cell format, 3.75V nominal rail, and two-wire BMS connector pinout. The Z2760 platform draws from the same power architecture, which is why one cell covers all three variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ThinkPad Tablet 2 unit. The BMS handshake completed on first connection, the charge IC accepted current without fault, and the fuel gauge began tracking state of charge correctly.
• Fuel gauge recalibration after swap: After installing this battery, run the tablet down to automatic shutoff — do not force it off — then charge uninterrupted to 100%. This gives the fuel gauge IC a full reference cycle against the new cell and corrects the inaccurate percentage readings that almost always appear after a battery change.

Why the ThinkPad Tablet 2 shuts down at 15–25% remaining

The Intel Atom Z2760 platform draws a combined load from the IPS display backlight and Wi-Fi radio simultaneously. At around 3.5V cell voltage, this combined draw causes a brief voltage sag that the BMS reads as undervoltage and triggers a protective cutoff — even though the fuel gauge still shows charge remaining. The old cell makes this worse as capacity fades, because the internal resistance rises and the sag deepens faster. A new cell with lower internal resistance holds the voltage rail above the cutoff threshold longer, eliminating the premature shutdown.

Percentage jumping or freezing immediately after installation

The ThinkPad Tablet 2 stores fuel gauge calibration data tied to the original cell's charge curve. When a new cell goes in, that stored data no longer matches the actual cell, so the OS reports incorrect or erratic percentages — sometimes freezing at a fixed number or jumping suddenly. This is a calibration mismatch, not a faulty battery. Run one complete discharge cycle to automatic shutoff, then charge straight to 100% without interruption. After that cycle, the fuel gauge IC rewrites its reference data against the new cell and the percentage display stabilises.