L15L3PB0 Lenovo Flex 4 1470 Compatible Battery 11.4V 4500mAh

Lenovo Flex 4 1470 / Yoga 520 Series — 11.4V Li-Polymer Replacement Battery (L15L3PB0)

This is an 11.4V, 4500mAh (51.3Wh) Li-Polymer battery for the Lenovo Flex 4 1470, Flex 4 1480, Yoga 520-14IKBR, and related 2-in-1 convertible models. It replaces OEM part numbers L15L3PB0, 5B10K85055, 5B10K84492, and several cross-referenced variants. Install it when the original cell no longer holds adequate charge or the system refuses to run untethered.

• Flex 4 and Yoga 520 platform fit: These models share the same 11.4V three-cell Li-Polymer architecture, identical connector pinout, and matching BMS handshake protocol — which is why a single OEM part number (L15L3PB0) covers both series without modification.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles on a Flex 4 1470 unit and confirmed the BMS completed full charge termination at the correct cutoff voltage with no false fault flags or mid-cycle interruptions.
• First-install calibration on Lenovo convertibles: After fitting this battery, run the system down to hibernate-cutoff on battery alone, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first boot after every cell swap.

BIOS reporting poor battery health immediately after replacement

Lenovo's embedded controller reads cycle count and health data from EEPROM on the outgoing cell. When a new cell arrives, that EEPROM data is blank or mismatched, so the controller flags the battery as degraded before a single cycle has run. This is not a fault with the replacement — it is a carry-over read from the old cell's stored values. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite its battery learn table against the new cell. After that cycle, the health indicator resets to normal.

Laptop shuts down abruptly at 20–30% charge remaining

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. During combined CPU and display load, voltage drops faster than the uncalibrated gauge predicts, and the BMS triggers a protective shutdown before the displayed percentage reaches zero. It is not a defective cell — the gauge IC simply needs two or three full discharge-to-charge cycles to map the new cell's voltage-to-capacity relationship accurately. Run the system on battery through complete discharge cycles and the early shutdowns will stop once the gauge converges on the correct curve.