Lenovo ThinkPad X1 Carbon 14 45N1701 Compatible Battery 14.8V
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Lenovo ThinkPad X1 Carbon 14 45N1701 Compatible Battery 14.8V - is backordered and will ship as soon as it is back in stock.
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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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Delivery and Shipping
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Lenovo ThinkPad X1 Carbon 14 45N1701 Compatible Battery 14.8V - is backordered and will ship as soon as it is back in stock.
Voltage
14.8V
Amp
3000mAh
Lenovo ThinkPad X1 Carbon 14 — 14.8V Li-Polymer Replacement Battery (45N1701)
This is a 14.8V, 3000mAh (44.4Wh) Li-Polymer cell for the Lenovo ThinkPad X1 Carbon 14 ultrabook. It fits the 20A7 and 20A8 chassis variants, along with the X1 Carbon 4th generation and related models. OEM part numbers covered include 45N1701, 45N1702, 45N1703, 00HW002, 00HW003, and SB10F46440.
- X1 Carbon 14 / 20A7 / 20A8 platform fit: These chassis share a 14.8V nominal rail, the same slim 5.34mm pack profile, and identical BMS handshake protocol — which is why one cell covers all three variants without modification.
- Bench tested on actual hardware: We cycled this cell on a ThinkPad X1 Carbon 20A8 and monitored the BMS through charge and load. The protection circuit held voltage within spec under sustained CPU and display load, and the pack accepted a full charge without triggering thermal cutoff.
- Post-install calibration on ThinkPad X1 Carbon: 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 battery health as poor after replacement
The ThinkPad BIOS stores battery state data in an EEPROM register tied to the old cell. When a new pack is installed, the BIOS reads stale cycle counts and Wh data, then flags the battery as degraded before it has run a single cycle. This is not a fault with the replacement cell — it is a data mismatch. Run the battery learn cycle in Lenovo Vantage under Power settings, or complete one full manual discharge-to-hibernate followed by an uninterrupted charge to 100%. After one to two full cycles, the BIOS recalibrates and the health warning clears.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet mapped its discharge curve against the new cell's actual voltage profile. Under full CPU plus display load, the cell voltage drops faster than the old calibration predicts, and the system hits its low-voltage cutoff while the gauge still shows 20–30% remaining. The fix is calibration, not a swap — discharge fully to hibernate, then charge to 100% without interruption. After two to three cycles, the fuel gauge IC recalibrates to the new cell and the early shutdowns stop.
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 installed the new battery?
The Wh value displayed in Lenovo Vantage is pulled from EEPROM data written by the original cell, not read dynamically from the new pack. Until the BIOS battery learn cycle runs against the replacement cell, the reported Wh figure reflects the old cell's rated chemistry. Open Lenovo Vantage, go to Power, and run the battery gauge reset — or complete one full discharge to hibernate followed by an uninterrupted charge to 100%. After that cycle the reported Wh will align with the 44.4Wh spec of this cell.
The battery shows as "Unknown" or 0% in Windows immediately after install — is the cell dead?
No — this is a fuel gauge IC initialisation issue. The ThinkPad's fuel gauge IC has no calibration data for the new cell yet, so Windows reports an unknown or zero state until the first charge cycle completes. Plug in the charger and let it run to 100% without unplugging. Once the pack reaches full charge and the BMS confirms cell voltage at the top-of-charge threshold (around 16.8V for a 4S Li-Polymer), Windows will begin reporting accurate state-of-charge figures.
My ThinkPad X1 Carbon stops charging at 80% and won't go higher — is this a faulty cell?
This is almost always the BIOS charge threshold, not a fault with the cell. Lenovo's firmware includes a Battery Charge Threshold feature that caps charging at 80% by default when Conservation Mode is active in Lenovo Vantage. Open Lenovo Vantage, navigate to Power → Battery settings, and confirm Conservation Mode is set to off. Once disabled, plug in and let the pack charge fully to 100% — this also begins the calibration cycle the new cell needs.
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