Lenovo LOQ 15APH8 5B11K38526 Replacement Battery 15.44V 3850mAh
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Lenovo LOQ 15APH8 5B11K38526 Replacement Battery 15.44V 3850mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Lenovo LOQ 15APH8 5B11K38526 Replacement Battery 15.44V 3850mAh - is backordered and will ship as soon as it is back in stock.
Voltage
15.44V
Amp
3850mAh
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.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Lenovo
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-Polymer
- Battery Type: Li-Polymer
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
Why does Lenovo Vantage show the wrong Wh rating after I put in the new battery?
The Wh figure shown in Vantage pulls from EEPROM data written by the original cell, not from a live measurement of the new one. Until the BIOS battery learn cycle runs, the system displays whatever the old cell logged — this can be several Wh off in either direction. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%, and the reported Wh figure will update to match the new cell's actual rated capacity of 59.44Wh.
My LOQ 15APH8 stops charging at 80% and won't go higher — is the new battery faulty?
This is almost always the BIOS-controlled charge limit in Lenovo Vantage, not a fault with the cell. Lenovo ships many LOQ units with "Conservation Mode" enabled by default, which caps charging at roughly 80% to reduce long-term cell stress. Open Lenovo Vantage, go to Power, select Battery Settings, and switch from Conservation Mode to Normal Mode — charging will then complete to 100%.
The fuel gauge on my LOQ 15APH8 jumps around wildly for the first few days after swapping the battery — is something wrong?
Nothing is wrong — the fuel gauge IC is still using the voltage-to-capacity curve it built for the original cell, so its readings against the new chemistry are inaccurate until it recalibrates. The IC needs two to three full discharge-and-charge cycles to map the new cell correctly. Let the laptop discharge fully to hibernate each time, then charge straight to 100% without interruption, and the gauge will stabilise by the third cycle.
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