About this replacement
Lenovo Yoga 720-13IKB / 730-13IKB — 7.68V Li-Polymer Replacement Battery (L16L4PB1)
This 7.68V, 6000mAh (46.08Wh) lithium-polymer cell replaces the original battery in the Lenovo Yoga 720-13IKB and Yoga 730-13IKB 13-inch convertible ultrabooks. It fits the full compatibility range including 80X6006QAU, 81CT007CAU, 81CT005NMZ, and 81C3002MGE variants. OEM part numbers covered include L16L4PB1, L16M4PB1, L16C4PB1, 5B10M52211, 5B10M52740, 5B10Q38238, 5B10W67229, and SB10W6727.
- Yoga 720 and 730 shared battery platform: Both the 720-13IKB and 730-13IKB series use the same 7.68V two-cell Li-Polymer configuration, identical connector pinout, and the same BMS handshake protocol — so one cell fits the entire platform without modification.
- Bench tested on actual hardware: We ran this cell on a Yoga 720-13IKB. The BMS accepted the new cell without fault codes, charge current stepped correctly from bulk to CV phase, and the fuel gauge IC began tracking state-of-charge within one full cycle.
- Post-install calibration tip for Yoga convertibles: After fitting, run the laptop off battery until it hibernates at cutoff, 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 720 and 730 store battery health data in EEPROM on the old cell. When a new cell goes in, the BIOS reads zero charge cycles and a full-capacity rating it hasn't verified yet — so it flags health as unknown or poor. This is not a fault with the new cell. Run one full discharge-to-hibernate cycle followed by a full uninterrupted charge. The BIOS battery learn cycle rewrites the EEPROM baseline against the new cell chemistry and the health warning clears.
Laptop shutting down at 20–30% shown on the fuel gauge
This happens when the fuel gauge IC hasn't calibrated against the new cell yet. The gauge is estimating state-of-charge based on the old cell's discharge curve, so it reads 25% while the actual cell voltage has already hit the BMS cutoff floor near 6.0V under load. The fix is two to three full discharge-and-charge cycles so the fuel gauge IC maps the new cell's actual voltage curve. After calibration, the percentage readout and the real cutoff point will line up correctly.