Lenovo Yoga S730 Replacement Battery 15.36V 5B10R32748

Lenovo Yoga S730-13IWL — 15.36V Li-Polymer Replacement Battery (5B10R32748)

This 15.36V, 2650mAh (40.7Wh) Li-Polymer cell replaces the original battery in the Lenovo Yoga S730 and Yoga S730-13IWL series ultrabooks. It matches OEM part numbers 5B10R32748, L17C4PE1, L17M4PE1, L17L4PE1, 928QA232H, and SB10W67305. The slim 3.50mm profile fits within the S730's tight chassis without modification.

• Yoga S730-13IWL series fit: All S730-13IWL variants share the same 15.36V four-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol. This cell covers the 81J0 board revision and all regional SKUs listed under that chassis.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the S730 platform. The BMS negotiated correctly with the EC firmware, reported voltage accurately at each state-of-charge step, and held charge termination at the correct cutoff without triggering over-voltage protection.
• Post-install recalibration on the S730: After fitting this cell, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100% without waking the system. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the Yoga S730 shuts down at 20–30% after a battery swap

The S730's fuel gauge IC stores a learned discharge curve from the old cell in EEPROM. When a new cell goes in, the IC maps the old curve onto different chemistry data and calls the voltage cliff too early. The laptop interprets a normal mid-discharge voltage as critical and triggers an emergency shutdown. Running one full discharge-to-hibernate cycle forces the IC to relearn where the actual voltage floor sits on the new cell, typically around 14.4V under load.

BIOS reporting the replacement cell as 0% or unknown health

The S730 BIOS reads battery health from EEPROM flags written by the original Lenovo cell during factory calibration. A new cell arrives with a blank or mismatched EEPROM state, so the BIOS flags it as unknown or poor before any calibration data exists. This is not a fault with the cell itself. Perform one full discharge-to-hibernate followed by a complete uninterrupted charge to 100% — the BIOS learn cycle writes fresh health data and the warning clears on the next boot.