Lenovo ThinkPad X1 Nano L19M3P72 Replacement Battery 11.58V
Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.
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Lenovo ThinkPad X1 Nano L19M3P72 Replacement Battery 11.58V - 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 X1 Nano L19M3P72 Replacement Battery 11.58V - is backordered and will ship as soon as it is back in stock.
Voltage
11.58V
Amp
4050mAh
Lenovo ThinkPad X1 Nano — 11.58V Li-Polymer Replacement Battery (L19M3P72)
This is an 11.58V, 4050mAh (46.9Wh) Li-Polymer battery for the Lenovo ThinkPad X1 Nano and X1 Nano Gen 1 series. It replaces OEM part numbers L19M3P72, L19M3P73, L19C3P71, and several associated Lenovo SKUs including 5B10W13962 and SB10T83205. If your original cell has degraded, failed to charge, or BIOS is reporting poor health after extended use, this is the direct cell replacement.
- X1 Nano Gen 1 platform compatibility: The X1 Nano Gen 1 variants share a common battery bay dimension and BMS handshake protocol across all regional SKUs. The connector pinout and voltage rail are identical across 20UN and 20UQ chassis codes, which is why multiple OEM part numbers cross-reference to the same physical cell.
- Bench tested on actual hardware: We ran this cell on a ThinkPad X1 Nano Gen 1 unit. The BMS completed handshake without fault codes. Charge acceptance started immediately from a depleted state and BIOS detected the battery as a recognised Lenovo cell on first boot.
- BIOS learn cycle after install: After fitting this cell, run the laptop down to hibernate-cutoff on battery power, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap — skipping this step leaves the fuel gauge reading incorrectly for weeks.
Laptop shutting down at 20–30% remaining after battery swap
This is a voltage cliff issue, not a capacity fault. The X1 Nano pulls combined CPU and display load that forces the cell voltage to drop sharply below what the old BIOS profile expects. The firmware was calibrated against the original cell's discharge curve — a new cell with slightly different internal resistance hits the cutoff voltage threshold earlier under full load. Run two full discharge-to-hibernate cycles back-to-back to recalibrate the fuel gauge IC against the new cell's actual curve.
BIOS showing wrong Wh rating after replacement cell install
The Wh figure shown in BIOS and Lenovo Vantage is pulled from the cell's EEPROM data, not measured live from the new cell. Different OEM part revisions — L19M3P72 versus L19C3P71, for example — carry slightly different EEPROM-rated Wh values even when the physical chemistry is equivalent. This mismatch does not affect charge behaviour or capacity. If the discrepancy concerns you, verify the actual cell voltage under load with HWiNFO64 — it should read between 11.1V and 12.6V across the charge range.
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
My ThinkPad X1 Nano keeps cutting off at around 25% after I put the new battery in — is the cell faulty?
The cell is almost certainly fine. The X1 Nano's BIOS uses a discharge curve learned from the original cell, and a new cell with different internal resistance hits the firmware's voltage cutoff threshold earlier under combined CPU and display load. Run two complete discharge-to-hibernate cycles on battery power, charging fully between each one. After that the fuel gauge IC recalibrates to the new cell's actual curve and the premature shutdowns stop.
Lenovo Vantage is reporting the new battery as "poor health" or "unknown" straight after install — what's causing that?
The health status in Vantage reads from EEPROM data written when the old cell was last active. A fresh cell has no logged cycle history, so the firmware flags it as unknown or poor until it completes a full learn cycle. Discharge the laptop to hibernate-cutoff, then charge uninterrupted to 100% — this writes new baseline data to the BIOS battery profile and clears the warning on the next boot.
The battery charge stopped at 80% and won't go higher — is something wrong with this cell?
Nothing is wrong with the cell. Lenovo BIOS includes a charge threshold feature — often enabled by default or through Lenovo Vantage — that caps charging at 80% to reduce calendar ageing on the original cell. Open Lenovo Vantage, go to Device → Power, and set the charge threshold to 100%. If Vantage is not installed, access the same setting in BIOS under Config → Power → Charge Threshold and set the stop value to 100.
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