About this replacement
Lenovo Yoga S740 14 / IdeaPad S740-14IIL — 15.36V Li-Polymer Replacement Battery (L19L4PD2)
This is a 15.36V, 3950mAh (60.67Wh) Li-Polymer battery for the Lenovo Yoga S740 14 and IdeaPad S740-14IIL (81RT) ultrabook. It replaces OEM part numbers L19L4PD2, L19M4PD2, SB10W67348, SB10W67352, 5B10U97772, 5B10U97773, 5B10W67253, and 5B10W67424. If your original cell has degraded or swollen, this swap restores portable operation at the correct voltage and capacity.
- Yoga S740-14IIL platform fit: The S740-14IIL shares one battery bay layout and connector pinout across its IIL variants. The 15.36V nominal rail and four-cell Li-Polymer configuration are fixed by the motherboard's charging IC — this cell meets that spec exactly.
- Bench tested on actual hardware: We ran this cell in a Yoga S740-14IIL and confirmed the BMS handshake completed, charge current initiated within 30 seconds of plug-in, and the EC recognised the pack without flagging an unknown battery error.
- Post-swap BIOS learn cycle: After fitting this cell, discharge the laptop to automatic hibernate, then charge uninterrupted to 100% before unplugging. This single cycle lets the BIOS fuel gauge IC recalibrate against the new cell and clears the false "poor health" warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor immediately after replacement
The Yoga S740-14IIL stores battery state data in EEPROM on the original pack. When a new cell is fitted, the BIOS reads no charge history and flags health as poor or unknown — this is an EC firmware response, not a fault with the replacement cell. The fix is a full learn cycle: run the laptop on battery until it hibernates on its own, then charge straight to 100% without interruption. After one complete cycle, the fuel gauge IC rewrites its baseline and the health warning clears. If it persists after two cycles, check that battery conservation mode is disabled in Lenovo Vantage.
Laptop shuts down at 20–30% charge shown on screen
This is a voltage cliff issue. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC expects — the EC reads the drop as imminent cutoff and triggers shutdown before the displayed percentage reaches zero. It happens most often in the first few cycles when the gauge hasn't mapped the new cell's discharge curve. Run two full discharge-to-hibernate cycles and the IC recalibrates its voltage-to-percentage table. After calibration, shutdowns at 20–30% shown stop; if they continue, check that the display brightness and CPU performance profile aren't both set to maximum simultaneously, which pushes draw above 25W and steepens the voltage drop.