About this replacement
Lenovo Air 14 / Flex 6-14 / IdeaPad 530S — 7.68V Li-Polymer Replacement Battery (L17C4PB0)
This 7.68V, 5800mAh (44.54Wh) lithium-polymer battery replaces the L17C4PB0 cell in the Lenovo Air 14, Flex 6-14, Flex 6-14IKB, and IdeaPad 530S-15IKB (81EV), along with 139 additional compatible models. It uses the same connector, BMS pinout, and voltage rail as the original Lenovo cell. Capacity figures are taken directly from product data — not estimated.
- Air 14 / Flex 6-14 / IdeaPad 530S-15IKB platform fit: These models share the L17C4PB0 form factor because they run the same 7.68V two-cell Li-Polymer architecture with identical BMS handshake requirements. The BIOS on each reads cell voltage and EEPROM data through the same SMBus protocol — one cell swap covers all variants in this cluster.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Air 14 platform. The BMS authenticated correctly, the BIOS acknowledged the cell without error flags, and charge current stepped down at the expected voltage threshold approaching 100%.
- Post-install discharge cycle: After fitting this cell, run one full discharge to the hibernate-cutoff point, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears on almost every cell swap in this platform.
Why the IdeaPad 530S shuts down at 20–30% remaining after a battery swap
The fuel gauge IC on this platform tracks cell capacity using learned data from the previous cell. When a new cell goes in, that stored data is wrong — the IC thinks the voltage cliff arrives earlier than it actually does on fresh chemistry. Under combined CPU and display load, the laptop hits what it believes is the safe-cutoff threshold and shuts down, even though real charge remains. Running two to three full discharge-to-hibernate cycles recalibrates the fuel gauge against the new cell's actual voltage curve and moves the shutdown point back to the correct level.
BIOS reporting the replacement cell as "poor health" or unknown immediately after install
The BIOS reads health status from EEPROM data embedded in the battery's BMS — not from live cell measurements. On first boot with a new cell, the EEPROM cycle count and wear data have not yet been written by the Lenovo firmware, so the BIOS flags the battery as unknown or degraded. This is a firmware-state issue, not a fault with the cell. Complete the full discharge-to-hibernate and uninterrupted charge cycle described above, then check battery status again — the BIOS should report normal health once the learn cycle has written fresh data to the EEPROM.