Lenovo ThinkPad S3 83AG003QAU Replacement Battery 15.56V 6400mAh
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Lenovo ThinkPad S3 83AG003QAU Replacement Battery 15.56V 6400mAh - 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
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Lenovo ThinkPad S3 83AG003QAU Replacement Battery 15.56V 6400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
15.56V
Amp
6400mAh
Lenovo ThinkPad S3 — 15.56V Li-Polymer Replacement Battery (5B11K39157)
This is a 15.56V, 6400mAh (99.58Wh) Li-Polymer battery for the Lenovo ThinkPad S3 series, including model 83AG003QAU and over 200 compatible variants. It replaces the original cell when the system no longer holds charge or powers on from battery alone. OEM part numbers covered include 5B11K39157, L22B4PC3, L22M4PC3, and fifteen additional cross-references.
- ThinkPad S3 series compatibility: These models share the same 15.56V four-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol. The SMBus communication between battery and EC firmware is identical across the 83AG range, so a single cell covers the full cluster.
- Bench tested on actual hardware: We cycled this cell through charge, full-load discharge, and hibernate-cutoff on a ThinkPad S3 unit. The BMS negotiated correctly with the EC at first boot, and the protection circuit tripped at the expected low-voltage threshold without triggering a false shutdown.
- First-cycle reset after installation: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity curve and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting battery health as poor immediately after replacement
The ThinkPad EC reads health data from the battery's EEPROM, which stores cycle count, rated capacity, and degradation flags from the previous cell. When a new cell is installed, the EEPROM values don't automatically reset — so the BIOS inherits the old cell's wear history and displays a poor health warning even though the cell is new. Running the battery learn cycle (full discharge to hibernate, full uninterrupted charge) prompts the EC to re-baseline against the new cell. After one or two completed cycles, the health indicator updates to reflect the actual cell condition.
Laptop shutting down at 20–30% charge shown on screen
This is a voltage-cliff failure, not a fuel gauge error. Under combined CPU and display load, cell voltage drops faster than the fuel gauge IC can track — the pack hits the BMS low-voltage cutoff while the OS still reads 20–30% remaining. It happens most often when the calibration cycle has never been completed after fitting a new cell. Run a full discharge-to-hibernate followed by a complete charge to 100%, which forces the fuel gauge IC to recalibrate its state-of-charge model against the new cell's actual voltage curve. After calibration, the shutdown threshold and displayed percentage should align at or below 5%.
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
The ThinkPad S3 shows 0% or "unknown battery" in Windows immediately after fitting the new cell — what causes that?
The fuel gauge IC on the motherboard lost its reference data when the old cell was removed, and it has no state-of-charge baseline for the new cell yet. Boot into Windows, let the battery discharge fully to hibernate-cutoff, then charge uninterrupted to 100%. After that first complete cycle the fuel gauge IC recalibrates and the OS reads the correct percentage.
System info shows the wrong Wh rating — 57Wh or some other figure instead of 99.58Wh — after installing this battery. Is the cell faulty?
The Wh figure Windows displays comes from the EEPROM data embedded in the battery pack, not from a live measurement. If the EC has cached the previous cell's rated capacity it will display that until it re-reads the new pack's EEPROM. Power-cycle the laptop twice with the new cell seated and the correct 99.58Wh value should appear in Device Manager under Battery > Microsoft ACPI-Compliant Control Method Battery > Details.
The ThinkPad S3 stops charging at exactly 80% and won't go higher — is this a fault with the replacement cell?
This is a BIOS-controlled charge limit, not a cell defect. Lenovo's power management firmware includes a conservation mode that caps charging at 80% to reduce long-term wear when the laptop is frequently plugged in. Open Lenovo Vantage, navigate to Power, and switch the charge threshold from "Conservation" to "Full Charge" — charging will then complete to 100%.
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