About this replacement
Lenovo IdeaPad 3-17ADA05 Series — 15.2V Li-Polymer Replacement Battery (L19L4PF2)
This is a 15.2V, 3600mAh (54.72Wh) Li-Polymer battery for the Lenovo IdeaPad 3-17ADA05, IdeaPad 3-17ARE05, IdeaPad 3-17IML05, and IdeaPad 3-17IIL05. It replaces OEM part numbers L19L4PF2, SB10W89847, and 5B10W89846. If your original cell has degraded or failed, this swap restores portable power to the machine.
- IdeaPad 3 17-inch series fit: The ADA05, ARE05, IML05, and IIL05 variants all use the same 15.2V four-cell rail, identical connector pinout, and the same BMS handshake protocol — which is why one part number covers all four models.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an IdeaPad 3 chassis. The BMS communicated correctly with the BIOS, charge current tapered as expected at top-of-charge, and no fault codes were logged during the test session.
- Post-install calibration on IdeaPad 3: After fitting this battery, run the laptop down to hibernate-cutoff on battery only, then charge uninterrupted to 100% without unplugging. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the IdeaPad 3 shuts down at 20–30% remaining after a battery swap
The IdeaPad 3 BIOS tracks a discharge curve learned from the original cell. When a new cell goes in, the stored curve no longer matches the actual voltage-to-capacity relationship of the fresh chemistry. Under full CPU plus display load, the new cell's real voltage drops faster than the BIOS expects, and the firmware triggers an emergency shutdown before the gauge reads zero. This is not a fault with the replacement cell. One full calibration discharge — run to hibernate, then charge to 100% uninterrupted — rewrites the learned curve and stops the premature cutoff.
BIOS reporting the new battery as "Unknown" or showing 0% on first boot
The BIOS reads health and capacity data from the EEPROM on the battery's BMS board. On first install, the system hasn't yet completed a handshake cycle against the new cell's EEPROM, so it reports unknown status or zero charge. This clears after the first complete charge cycle — plug in, charge to 100% without interruption, then reboot. If the warning persists after two full cycles, check that the battery connector is fully seated; a partial connection breaks the data line even when the power pins are making contact.