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Lenovo ThinkPad X1 Carbon 45N1070 Replacement Battery 14.8V 3100mAh

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From $118.99 USD $142.99
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Fits Lenovo ThinkPad X1 Carbon 3460-22U and replaces OEM part 45N1070 or 45N1071.
14.8V, 3100mAh Li-Polymer cell delivers 45.88Wh to restore full work sessions on this ultrabook.
Connector seats flush into the internal bay; locking tab secures the pack against the chassis.
We bench-tested this cell in a 3460-22U; the BMS accepted charge immediately with no cutoff errors.
After installation, run one full discharge to hibernation-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the health warning that appears 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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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.

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🔹 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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

14.8V

Amp

3100mAh

Lenovo ThinkPad X1 Carbon 3460-22U Series — 14.8V Li-Polymer Replacement Battery (45N1070)

This is a 14.8V, 3100mAh (45.88Wh) Li-Polymer replacement battery for the Lenovo ThinkPad X1 Carbon. It fits the 3460-22U, 3460-23U, 3460-25U, 3444-53U, and related variants. It replaces OEM part numbers 45N1070 and 45N1071.

  • X1 Carbon 3460 and 3444 series fit: These models share the same 14.8V battery rail, physical footprint, and connector pinout. The BMS handshake protocol is consistent across the listed variants, so one cell works across the full range without modification.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the X1 Carbon platform. The BMS communicated correctly with the host, charge termination triggered at the expected voltage ceiling, and no protection-circuit trips occurred under sustained CPU and display load.
  • Post-install calibration on the X1 Carbon: After fitting the new 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 replacement

The X1 Carbon reads battery health data from EEPROM stored on the old cell. When a new cell installs, the BIOS compares live readings against stale EEPROM values and flags a mismatch as poor health. This is not a fault with the replacement cell. Running the Lenovo battery learn cycle — one full discharge to hibernate cutoff followed by a full uninterrupted charge — writes fresh calibration data and resolves the warning. After one complete cycle, the health status should return to normal in both the BIOS and Lenovo Vantage.

Laptop shutting down with 20–30% charge still shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The displayed percentage is based on old reference data, so the system hits a real voltage floor while the gauge still reads high. Under full CPU and display load, the cell voltage drops faster than the IC predicts, triggering an emergency shutdown. Run two full discharge-to-hibernate and full-charge cycles — after that, the fuel gauge IC builds an accurate model of the new cell and the shutdowns stop. Confirm calibration is complete when the battery reaches 0% at hibernate without an abrupt cutoff above 15%.

Compatible Models

ThinkPad X1 Carbon 3460-22U ThinkPad X1 Carbon 3460-23U ThinkPad X1 Carbon 3460-25U ThinkPad X1 Carbon 3444-53U ThinkPad X1 Carbon 3444-2HU ThinkPad X1 Carbon 3444 ThinkPad X1C Carbon ThinkPad X1 Carbon 3448 ThinkPad X1 Carbon ThinkPad X1 Carbon 3448-24U ThinkPad X1 Carbon 3460-37U

Replaces Part Numbers

45N1070 45N1071

Technical Specifications

Voltage14.8V
Amp Hours3100mAh
Capacity3100mAh
Rate45.88Wh
Net Weight272g /9.59 oz
Gross Weight532g /18.77 oz
Approximate Weight532g /18.77 oz
Dimension 299.25 x 117.30 x 6.50mm

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 X1 Carbon shows the replacement battery as "0%" and won't charge — is the cell dead?

It's not dead. The BIOS on the X1 Carbon reads EEPROM data from the previous cell, and when that data is missing or mismatched, the fuel gauge IC can report 0% on a fully charged cell. Connect the AC adapter and leave it for 30 minutes without powering on — this allows the BMS to initialise. If the charge LED activates, the cell is communicating correctly. Boot into the BIOS and run the built-in battery diagnostic to force a fresh EEPROM read.

System info shows the wrong Wh rating — it says 23Wh instead of 45Wh after the swap.

The Wh value displayed in Windows or Lenovo Vantage pulls from the EEPROM on the battery cell, not from a live measurement. A new cell ships with factory EEPROM data that may not match the previous cell's stored value until the fuel gauge IC runs a full calibration cycle. Run one complete discharge to hibernate cutoff, then charge uninterrupted to 100%. After that cycle, the system recalculates the Wh figure against actual cell chemistry, and the reported value corrects to the rated 45.88Wh.

Charge stops at 80% and won't go higher — is something wrong with the new battery?

Nothing is wrong with the cell. The X1 Carbon has a BIOS-controlled charge limit feature — when enabled, it deliberately caps charging at 80% to reduce stress on the cell during daily use. Check Lenovo Vantage under Power → Battery Charge Threshold and confirm the limit is set to 100% if you want a full charge. This is a firmware setting, not a battery fault, and it persists across battery replacements because the setting lives in the BIOS, not the cell.

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