About this replacement
Lenovo IdeaPad 5 Pro Series — 15.36V Li-Polymer Replacement Battery (L20C4PE1)
This is a 15.36V, 4750mAh (72.96Wh) Li-Polymer battery for the Lenovo IdeaPad 5 Pro lineup, including the 16IHU6, 16ACH6, and IdeaPad Creator 5-16ACH6 variants. It replaces OEM part numbers L20C4PE1, L20L4PE1, and L20M4PE1. Physical dimensions are 322.26 × 119.50 × 6.30mm — measure your original before ordering if you are unsure of your exact sub-model.
- IdeaPad 5 Pro 16-inch platform fit: The 16IHU6 (Intel) and 16ACH6 (AMD) share the same battery bay geometry, connector pinout, and BMS handshake protocol — which is why all three OEM part variants are interchangeable across those boards.
- Bench tested on actual hardware: We ran this cell on an IdeaPad 5 Pro-16ACH6 board. The BMS negotiated charge current correctly on first insertion, and the protection circuit tripped at the expected low-voltage cutoff without requiring a manual reset.
- Post-install calibration on IdeaPad 5 Pro: After fitting this battery, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to complete against the new cell and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting battery health as poor immediately after fitting a new cell
The IdeaPad 5 Pro stores battery wear data in EEPROM on the original cell. When a new cell goes in, the BIOS reads that stored data and flags a mismatch — it has no baseline yet for the new chemistry. This is a firmware state, not a cell fault. Running one complete discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle. After two or three full cycles, the health indicator normalises and the warning clears.
Laptop shutting down at 20–30% shown on the gauge after battery swap
This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. The new Li-Polymer cell hits a voltage cliff around 3.0V per cell under combined CPU and display load, and the board cuts power before the gauge catches up. The percentage reading is wrong, not the battery. Run two full discharge-to-hibernate cycles and let the gauge IC re-map the new cell's curve. After that, shutdowns should align with what the gauge actually shows — expect the cutoff to stabilise near 5–8% rather than 20–30%.