About this replacement
Lenovo LOQ 15APH8 Series — 15.44V Li-Polymer Replacement Battery (L22M4PA0)
This is a 15.44V, 3850mAh (59.44Wh) Li-Polymer replacement battery for the Lenovo LOQ 15APH8 gaming laptop. It fits the 82XT series variants including 82XT0002US, 82XT0005US, 82XT000JTA, 82XT000MFR, and over 335 additional LOQ 15APH8 configurations. OEM part numbers covered include L22B4PA0, L22C4PA0, L22D4PA0, L22L4PA0, L22X4PA0, 5B11K38526, and related SB11 variants.
- LOQ 15APH8 82XT series fit: All 82XT variants share the same 15.44V four-cell architecture, identical connector pinout, and the same BMS handshake protocol with the EC firmware. A single cell swap covers the full variant range without modification.
- Bench tested on actual hardware: We ran this cell on an LOQ 15APH8 under sustained GPU and CPU load. The BMS held the 15.44V rail steady through repeated high-draw cycles, and charge termination signalled correctly at 100% with no false cutoffs.
- Post-install calibration for the LOQ 15APH8: After fitting, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the system logs after every cell swap.
Why the LOQ 15APH8 reports poor battery health immediately after a cell swap
The LOQ 15APH8 stores cycle count, capacity history, and health state in EEPROM data tied to the original cell. When a new cell is installed, the BIOS reads that stale EEPROM data and flags health as degraded before a single charge cycle completes. This is not a fault with the replacement cell — it is a firmware artifact. Running a full discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the battery learn cycle and overwrites the residual EEPROM state with accurate readings from the new cell.
LOQ 15APH8 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. The gauge misreads the new cell's state of charge, and the system hits an actual low-voltage cutoff while the display still shows 20–30% remaining. The fix is calibration: discharge fully until the laptop hibernates on its own, then charge to 100% without interruption — repeat this two to three times. After those cycles the fuel gauge IC maps correctly to the new cell and the shutdown-before-zero behaviour stops.