About this replacement
Lenovo V17-IIL / IdeaPad 3-17IML05 — 11.25V Li-Polymer Replacement Battery (L19C3PF6)
This is an 11.25V 3700mAh (41.63Wh) lithium-polymer cell built to replace the L19C3PF6 battery in the Lenovo V17-IIL (82GX) and IdeaPad 3-17IML05 series. It also covers the IdeaPad 3-17IML0 81WCCTO1WW. The connector, BMS pinout, and cell voltage match the original Lenovo specification exactly.
- V17-IIL and IdeaPad 3-17IML05 platform fit: These models share the same 11.25V three-cell Li-Polymer architecture, identical 5-pin BMS connector, and the same OEM part reference (L19C3PF6 / SB10W89845 / 5B10W89838). The BMS handshake and charge termination logic is common across the whole series.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a V17-IIL unit. The BMS reported correct voltage at each stage, charge termination triggered cleanly at 12.6V, and the protection circuit tripped at expected low-voltage threshold without false cutoff.
- BIOS learn cycle after install: 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. Skip this step and Windows Battery Report will show misleading wear data for weeks.
Laptop shutting down at 20–30% shown on the V17-IIL
This is a voltage cliff issue, not a capacity fault. When the CPU boosts and the display draws full backlight simultaneously, cell voltage sags sharply under combined load. The BMS reads a momentary low-voltage condition and cuts output before the OS fuel gauge catches up. It is common on degraded cells but also appears on new cells that have not yet completed a BIOS learn cycle. Run a full discharge-to-hibernate followed by an uninterrupted charge to 100% — this gives the fuel gauge IC accurate data to map the cell's actual discharge curve.
New cell not charging above 80% on the IdeaPad 3-17IML05
Lenovo's BIOS includes a Conservation Mode that caps charge at 60%, and a charge threshold feature that caps it at 80%. Both are controlled in firmware, not by the battery cell itself. Check Lenovo Vantage under Power → Battery Settings and confirm Conservation Mode and the charge threshold are both off. Once disabled, charge should reach full termination voltage at 12.6V. This is a BIOS setting issue — the replacement cell is not at fault.