About this replacement
Lenovo Yoga Slim 7 15 / 7-15IMH05 — 15.36V Li-Polymer Replacement Battery (L19C4PF2)
This is a 15.36V, 4500mAh (69.12Wh) Li-Polymer replacement battery for the Lenovo Yoga Slim 7 15 and Yoga Slim 7-15IMH05 ultrabooks. It matches OEM part numbers L19C4PF2, 5B10X18187, L19M4PF2, SB10X18189, and SB10X18190. If your original cell has degraded or no longer holds a usable charge, this unit replaces it directly.
- Yoga Slim 7 15 and 7-15IMH05 compatibility: Both models share the same 15.36V power rail, physical footprint, and BMS handshake protocol. The connector pinout and EEPROM communication are identical across this generation, so one cell covers the full range.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Yoga Slim 7 platform and confirmed the BMS negotiated correctly, reported accurate state-of-charge, and held voltage under sustained CPU and display load without tripping a premature cutoff.
- Post-install calibration on the Yoga Slim 7: After fitting this cell, run one full discharge until the laptop hibernates on its own, 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 this platform.
BIOS reporting battery health as poor immediately after replacement
The Yoga Slim 7's BIOS reads health data from the battery's EEPROM at every boot. When a new cell arrives, that EEPROM carries rated chemistry data that hasn't yet been matched to actual charge cycles on this machine. The BIOS flags this mismatch as degraded health — it's a data gap, not a fault with the cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the firmware enough data to recalculate and clear the warning.
Laptop shutting down at 20–30% shown on the gauge after swap
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under combined CPU and display load, the new cell's actual voltage curve doesn't match the IC's stored model, so the system hits a low-voltage cutoff while the gauge still shows charge remaining. It's not a fault with the replacement — the fuel gauge needs two or three full discharge-and-charge cycles to recalibrate against the new cell's chemistry. After three complete cycles, the reported percentage and the actual cutoff point will align.