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Lenovo ThinkPad X12 Compatible Battery L19M4PG3 7.72V 5250mAh

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From $70.99 USD $87.99
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Fits Lenovo ThinkPad X12 Detachable, replaces L19M4PG3, 5B10Z26480, SB10Z26484, L19M4PG4, 5B10Z27861, L19C4PG4, 5B10Z27862, L19C4PG3, 5B10Z26487.
This 7.72V 5250mAh Li-Polymer cell delivers 40.53Wh, matching OEM capacity for full detachable tablet and stand operation without throttling.
Connector seats flush into the battery slot with locking tab engagement; no adapter needed for X12 Detachable chassis.
We ran discharge cycles on the cell under mixed CPU and display load; BMS responded normally without voltage sag at midrange.
After install, run one full discharge to hibernation cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false low-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.

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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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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

7.72V

Amp

5250mAh

Lenovo ThinkPad X12 Detachable — 7.72V Li-Polymer Replacement Battery (L19M4PG3)

This is a 7.72V, 5250mAh (40.53Wh) Li-Polymer replacement battery for the Lenovo ThinkPad X12 Detachable 2-in-1. It fits the detachable tablet unit directly, restoring untethered use when the original cell degrades. OEM part numbers L19M4PG3, L19M4PG4, L19C4PG3, L19C4PG4, 5B10Z26480, 5B10Z26484, 5B10Z26487, 5B10Z27861, and 5B10Z27862 all apply to this cell.

  • ThinkPad X12 Detachable compatibility: All OEM part numbers listed above share the same 7.72V voltage rail, connector pinout, and BMS handshake protocol used in the X12 Detachable. The BMS communicates battery state over SMBus — this cell carries the correct EEPROM initialisation data so the firmware recognises it without throwing an unknown-battery fault.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the X12 Detachable platform. The BMS accepted the cell without a protection-trip, charge current ramped correctly through CC/CV phases, and the SMBus handshake reported capacity within expected tolerance of rated 40.53Wh.
  • Post-install calibration for the X12 Detachable: After fitting, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity curve and clears the degraded-health warning that appears after any cell swap on this platform.

BIOS reporting poor battery health immediately after installation

The X12 Detachable BIOS reads health data cached in the old cell's EEPROM and carries that figure forward when a new cell is first detected. It has not yet run a learn cycle against the replacement, so the health percentage shown is not reflecting the new cell's actual state. This is a firmware calibration issue, not a cell fault. Run a full discharge to hibernate-cutoff followed by an uninterrupted charge to 100% — after that cycle the BIOS recalculates health against the new cell and the warning clears.

Fuel gauge reading erratically for the first few charge cycles

The fuel gauge IC on the X12 Detachable uses a coulomb-counter algorithm that was calibrated to the old cell's impedance and discharge curve. After a cell swap, the IC has no baseline for the new chemistry, so percentage jumps and drops unpredictably under load. Two to three full charge-discharge cycles give the IC enough data points to rebuild an accurate model. After those cycles, charge to 100% and let the display sit at rest — if the gauge still reads below 95% at full charge, check the charge voltage at the battery connector is reaching 8.72V.

Compatible Models

ThinkPad X12 Detachable

Replaces Part Numbers

L19M4PG3 5B10Z26480 SB10Z26484 L19M4PG4 5B10Z27861 L19C4PG4 5B10Z27862 L19C4PG3 5B10Z26487

Technical Specifications

Voltage7.72V
Amp Hours5250mAh
Capacity5250mAh
Rate40.53Wh
Net Weight160g /5.64 oz
Gross Weight300g /10.58 oz
Approximate Weight300g /10.58 oz
Dimension 247.00 x 97.45 x 3.36mm

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 X12 Detachable shuts off at around 25% battery shown — why does it cut out before zero?

The cell voltage drops sharply under combined CPU and display load at low state-of-charge — this is a voltage cliff the original degraded cell also hits, and the BIOS trips a low-voltage shutdown before the gauge reaches 0% to protect the BMS. After fitting the replacement, run the full discharge-to-hibernate calibration cycle so the BIOS learn routine maps the new cell's actual voltage curve. Once calibrated, the shutdown threshold aligns correctly with the displayed percentage. If the cutoff persists after two full cycles, confirm the hibernate trigger voltage is not manually set above the default in Power Manager.

Windows is showing the wrong Wh rating in Battery Report after installing this cell — it lists a different design capacity than 40.53Wh.

The EEPROM on the replacement cell stores rated design capacity, but Windows Battery Report pulls the figure the BIOS last wrote to the static data block — which may still reflect the old cell's factory-rated Wh. Run `powercfg /batteryreport` after completing two full charge-discharge cycles; the BIOS updates its stored design capacity figure once the learn cycle completes. If the report still shows an incorrect value after two cycles, clear the cached data by fully powering down, holding the power button for 15 seconds with the charger unplugged, then booting and charging to 100%.

Charge stops at 80% and the X12 Detachable will not charge beyond that — is the replacement cell faulty?

This is almost always the BIOS-controlled charge threshold in Lenovo Vantage, not a cell fault. Lenovo Vantage ships with a battery conservation mode that caps charging at 80% to reduce long-term cell stress — it applies to any cell the firmware recognises, including this replacement. Open Lenovo Vantage, go to Power → Battery, and check whether Conservation Mode or a custom charge threshold is active. Disable Conservation Mode and the charge ceiling returns to 100%.

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