About this replacement
Lenovo Yoga Tablet 3 YT3-850F / YT3-850M — 3.75V Li-ion Replacement Battery (L15C2K31)
This 3.75V, 6100mAh (22.88Wh) Li-ion cell replaces the original battery in the Lenovo Yoga Tablet 3, covering the YT3-850F and YT3-850M models. It fits the same physical bay and connector as OEM part numbers L15C2K31 and L15D2K31. Use this when the original cell no longer holds charge or the tablet fails to power on from battery.
- YT3-850F and YT3-850M compatibility: Both variants share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell covers both. The L15D2K31 cross-reference is electrically identical to L15C2K31 at 3.75V nominal.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a YT3-850M unit. The BMS accepted the cell without fault flags, charge current stepped down correctly at near-full capacity, and the fuel gauge tracked voltage within normal tolerance.
- BIOS learn cycle after swap: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Lenovo tablets.
Yoga Tablet 3 shutting down at 20–30% after a battery swap
The fuel gauge IC on the YT3-850 board is calibrated against the old cell's discharge curve. After a swap, it misreads the new cell's voltage cliff — the point where voltage drops sharply under load — and triggers a low-battery shutdown earlier than the actual state of charge warrants. This is not a fault with the replacement cell. Run two to three full discharge-to-hibernate and charge-to-100% cycles so the fuel gauge IC can map the new cell's curve and report accurately.
BIOS reporting the new battery's Wh rating as wrong in system info
Lenovo's BIOS reads the rated Wh value stored in the cell's EEPROM, not the actual chemistry output. If the value shown in Lenovo Vantage or the BIOS battery page differs from the 22.88Wh on the label, the EEPROM in the replacement cell is programmed to the factory default for that part number, which may vary slightly from what the original cell reported. This does not affect charging behaviour or capacity. Check the actual mWh reading in Windows Battery Report — run powercfg /batteryreport in an elevated command prompt — to confirm the cell is delivering its rated capacity.