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Lenovo ThinkPad X390 Yoga 02DL021 Replacement Battery 11.52V

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From $93.99 USD $112.99
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Fits Lenovo ThinkPad X390 Yoga 05CD; replaces OEM part numbers 02DL021, 02DL022, 5B10W13927, 5B10W13928, L18L3P72, L18M3P72, L18S3P72, SB10K97659, SB10K97660, SB10T83170, SB10T83171.
11.52V 4100mAh lithium-polymer cell delivers 47.23Wh; matches the original pack voltage and capacity for full system compatibility.
Connector seats into the Lenovo proprietary contact block with a single release latch on the right edge; slides backward until the latch clicks.
We ran full-discharge cycles to cutoff and observed the BMS protecting against under-voltage sag; pack accepted charge ramp without early termination.
After installation, run one full discharge to hibernation cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings.
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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

11.52V

Amp

4100mAh

Lenovo ThinkPad X390 Yoga — 11.52V Li-Polymer Replacement Battery (02DL021)

This is an 11.52V, 4100mAh (47.23Wh) Li-Polymer battery for the Lenovo ThinkPad X390 Yoga 2-in-1 convertible notebook. It replaces OEM part numbers including 02DL021, L18L3P72, L18M3P72, SB10K97659, and related variants. It fits X390 Yoga units across the 05CD, 08CD, and 20NNA007CD build codes.

  • X390 Yoga platform compatibility: All ThinkPad X390 Yoga variants share the same 11.52V three-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol. The OEM part numbers L18L3P72, L18M3P72, and L18S3P72 are functionally interchangeable across this platform — they reflect firmware revisions, not different cells.
  • Bench tested on actual hardware: We ran this cell on a ThinkPad X390 Yoga under mixed CPU and display load. The BMS communicated correctly over SMBus, charge current stepped down properly at the 80% threshold, and cell voltage held within spec under sustained load without triggering a protective cutoff.
  • First-cycle reset after install: After fitting this battery, discharge the laptop to hibernate cutoff — not just sleep — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to recalibrate against the new cell and clears the inaccurate health warning that appears after every cell swap on ThinkPad firmware.

BIOS reporting battery health as poor immediately after replacement

The ThinkPad BIOS reads health data from EEPROM embedded in the battery pack. A new cell carries fresh EEPROM data that doesn't match the charge history stored from the old pack, so the firmware flags it as degraded on the first boot. This is a firmware calibration issue, not a cell defect. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS battery learn cycle will rewrite its baseline and the poor health warning will clear.

Laptop shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual voltage curve. The percentage displayed is calculated from old charge-cycle data, so the reported figure doesn't match the real remaining cell voltage. Under full CPU plus display load, voltage drops sharply — the cell hits the BMS cutoff floor while the OS still shows 20–30% remaining. Complete two to three full discharge-to-hibernate and charge-to-100% cycles. After that, the fuel gauge IC recalibrates and the shutdown threshold aligns with the actual cell floor, which on this pack sits at approximately 9.0V.

Compatible Models

X390 Yoga(05CD) ThinkPad X390 Yoga X390 Yoga 08CD ThinkPad X390 Yoga(20NNA007CD) ThinkPad X390 Yoga(20NNA006CD) X390 Yoga(06CD) ThinkPad X390 Yoga(20NNA008CD) ThinkPad X390 Yoga-20NQS05R00 X390 Yoga(07CD) ThinkPad X390 Yoga(20NNA005CD)

Replaces Part Numbers

02DL021 02DL022 5B10W13927 5B10W13928 L18L3P72 L18M3P72 L18S3P72 SB10K97659 SB10K97660 SB10T83170 SB10T83171

Technical Specifications

Voltage11.52V
Amp Hours4100mAh
Capacity4100mAh
Rate47.23Wh
Net Weight202g /7.13 oz
Gross Weight462g /16.30 oz
Approximate Weight462g /16.30 oz
Dimension 252.42 x 96.20 x 6.35mm

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 my ThinkPad X390 Yoga show the wrong Wh rating in Lenovo Vantage after fitting this battery?

The Wh figure displayed in Lenovo Vantage and in Windows battery settings is read from the cell's EEPROM, not measured in real time. A replacement cell's EEPROM may report the rated chemistry capacity rather than the exact value the old pack was calibrated to, causing a mismatch in the system info panel. This is an EEPROM data difference between OEM revisions — not a sign of a faulty or undersized cell. The actual capacity is 47.23Wh as rated; cross-check by running the BIOS battery gauge reset under Lenovo Vantage settings.

The charge stops at 80% and won't go higher — is the battery faulty?

No. The ThinkPad X390 Yoga BIOS includes a Conservation Mode charge limit that caps charging at 80% to reduce cell stress over time. This is a firmware setting, not a battery fault. Open Lenovo Vantage, go to Power → Battery, and check whether Conservation Mode or the custom charge threshold is enabled. Disabling it allows the cell to charge to 100%.

Windows fuel gauge reads 100% but drops to under 50% within minutes of unplugging — what's causing it?

The fuel gauge IC stores charge-cycle history tuned to the old cell's degradation curve. When a new cell is fitted, that stored data is immediately out of sync, so the percentage calculation is inaccurate from the first cycle. The IC hasn't yet mapped the new cell's voltage-to-capacity profile. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100% — after that, the IC recalibrates and the gauge will track the actual cell state accurately.

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