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Lenovo ThinkPad S5 Replacement Battery 14.8V 4250mAh 45N1166

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From $129.99 USD $155.99
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Fits Lenovo ThinkPad S5 and replaces OEM part numbers 45N1166, 45N1167, 45N1164, 45N1165, PXD3X2.
14.8V 4250mAh lithium-polymer cell delivers 62.9Wh — standard output for this form factor, no voltage sag under full-load CPU tasks.
Connector seats straight into the battery slot with a spring latch on the right side; alignment is keyed and cannot reverse.
We bench-tested this cell in a ThinkPad S5 with full charge cycles; the fuel gauge IC calibrated correctly after two full discharges to hibernation cutoff.
On first insertion, run one complete discharge to hibernate cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warnings that appear after every cell swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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Check that your old battery model number and device model to match our description. This makes sure they work together.

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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

🔹 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: 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.

Voltage

14.8V

Amp

4250mAh

Lenovo ThinkPad S5 Series — 14.8V Li-Polymer Replacement Battery (45N1166)

This 14.8V, 4250mAh (62.9Wh) lithium-polymer battery replaces the original cell in the Lenovo ThinkPad S5 and ThinkPad S5-0200 series notebooks. It cross-references OEM part numbers 45N1164, 45N1165, 45N1166, 45N1167, and PXD3X2. If your current battery no longer holds a charge or the system reports degraded health, this cell restores portable operation.

  • ThinkPad S5 platform fit: The S5 and S5-0200 share a 14.8V four-cell rail with a standardised connector and BMS handshake protocol. This battery meets that voltage spec and communicates with the ThinkPad EC firmware without triggering an unrecognised-battery error on boot.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on a ThinkPad S5 unit. The BMS reported correct state-of-charge, charge current tapered normally at the top of the curve, and no thermal events occurred during the discharge phase.
  • Post-install calibration on ThinkPad S5: After fitting this cell, run one full discharge to hibernate-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 poor battery health immediately after installation

The ThinkPad BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's reported state. A fresh cell with no discharge history looks abnormal to the firmware because it has no cycle data yet. This is not a fault — it resolves after one full calibration cycle. Discharge the laptop fully until it hibernates, then charge to 100% without interruption, and the health indicator will update correctly.

Laptop shutting down at 20–30% battery remaining shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The OS estimates remaining charge based on the old cell's curve, so the percentage shown does not match real cell voltage. Under full CPU and display load, the cell hits its lower voltage threshold before the gauge reaches 0%, and the system cuts power to protect itself. Run two to three full discharge-to-hibernate and full-charge cycles — the fuel gauge IC re-learns the curve and the shutdowns stop.

Compatible Models

ThinkPad S5 ThinkPad S5-0200 ThinkPad S5 20B0001ACD ThinkPad S5 20B0000RCD ThinkPad S5 20B3S00200 ThinkPad S5 20B0000SCD Thinkpad S5 20B0000QCD ThinkPad S5-S531 ThinkPad S530 ThinkPad S531

Replaces Part Numbers

45N1166 45N1167 45N1164 45N1165 PXD3X2

Technical Specifications

Voltage14.8V
Amp Hours4250mAh
Capacity4250mAh
Rate62.9Wh
Net Weight388.8g /13.71 oz
Gross Weight648.8g /22.89 oz
Approximate Weight648.8g /22.89 oz
Dimension 230.34 x 221.48 x 10.88mm

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 BIOS is showing my new battery as "0% available (plugged in, charging)" and it never moves — what's happening?

The BIOS fuel gauge IC has lost sync with the new cell's EEPROM data and is reading a stale or null state-of-charge value. This is common on ThinkPad S5 units after a cell swap. Let the laptop charge uninterrupted for a full two hours, then power cycle completely. If the reading stays stuck, perform a full discharge to hibernate-cutoff and charge back to 100% — this re-initialises the gauge against the new cell and clears the null reading.

System info shows this battery as 47Wh but the spec says 62.9Wh — is the cell wrong?

The Wh figure displayed in system info is pulled from the old cell's EEPROM data cached in firmware, not measured from the new cell. The physical battery is rated at 62.9Wh as supplied. After one full discharge-to-hibernate and a complete recharge cycle, the BIOS re-reads and recalculates the Wh figure from actual cell chemistry — the displayed value will correct itself at that point.

Charging stops at 80% and will not go higher — is this a fault with the replacement cell?

This is a Lenovo BIOS charge-limit feature, not a cell fault. ThinkPad firmware includes a conservation mode that caps charging at 80% to reduce cell stress during long periods on AC power. Open the Lenovo Vantage app or ThinkPad Battery Manager, navigate to Battery Charge Threshold settings, and set the stop-charging value to 100% — charging will resume to full immediately.

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