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Dell XPS L421x 14.8V Replacement Battery 4RXFK 68Wh

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From $128.99 USD $154.99
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Fits Dell XPS 13 L421x ultrabook; replaces OEM part numbers 4RXFK, C1JKH, FFK56.
14.8V 4600mAh lithium-polymer cell delivers the capacity of the factory pack for full workday sessions.
Connector slides into the battery slot with a single locking tab at the front; no adapter needed.
We tested this cell on the L421x motherboard—the BMS accepted the new EEPROM handshake without fault codes on first charge.
Run one full discharge cycle to system hibernation 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.
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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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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⚠️ 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.

Voltage

14.8V

Amp

4600mAh

Dell XPS L421x — 14.8V Li-Polymer Replacement Battery (4RXFK / C1JKH / FFK56)

This 14.8V 4600mAh (68.08Wh) lithium-polymer battery replaces the original pack in the Dell XPS 14 L421x ultrabook. It fits the XPS L421x, XPS 14-L421x, XPS 14 Ultrabook, and XPS 14 L421X Ultrabook. Cross-references OEM part numbers 4RXFK, C1JKH, and FFK56.

  • XPS 14 L421x platform fit: All listed L421x variants share the same 14.8V battery rail, connector pinout, and BMS handshake protocol. The BIOS on these ultrabooks validates cell presence via the battery management controller — this pack carries the correct EEPROM signature to pass that check on first boot.
  • Bench tested on actual hardware: We ran this cell through charge, discharge, and a full BMS communication check on L421x hardware. The protection circuit responded correctly to overvoltage and undervoltage cutoff thresholds, and the pack reported accurate state-of-charge data back to the system throughout the cycle.
  • First-cycle reset on the L421x: After installing, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. The L421x BIOS uses a battery learn cycle to calibrate its fuel gauge IC against the new cell — skipping this step is why most users see an inaccurate health warning immediately after a swap.

BIOS reporting poor battery health right after installing a new cell

The L421x BIOS reads health data from EEPROM embedded in the battery management controller, not from the cell chemistry directly. When a new pack is installed, the BIOS still holds the previous cell's degradation history and flags the replacement as suspect. This is not a fault with the new battery — it is a calibration state. Run a single full discharge to hibernate cutoff followed by a full uninterrupted charge to 100V; this triggers the BIOS learn cycle and overwrites the stale EEPROM reference data.

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

This shutdown pattern points to a voltage cliff under combined CPU and display load, not a capacity problem. When the L421x runs a high-demand task, instantaneous current draw spikes and cell voltage drops sharply — if the fuel gauge IC has not yet calibrated to the new cell, the reported percentage and the actual cell voltage diverge fast. The BMS interprets the voltage drop as a critical low and triggers an emergency cutoff before the displayed percentage reaches zero. Run two full calibration cycles — discharge to hibernate, charge to 100% — and the fuel gauge IC will track the new cell's voltage curve accurately.

Compatible Models

XPS L421x XPS 14-L421x XPS 14 Ultrabook XPS 14 L421X Ultrabook Studio XPS 14 XPS14-2818 XPS14 LX421 421x-1046 XPS14 L412Z

Replaces Part Numbers

4RXFK C1JKH FFK56

Technical Specifications

Voltage14.8V
Amp Hours4600mAh
Capacity4600mAh
Rate68.08Wh
Net Weight372g /13.12 oz
Gross Weight632g /22.29 oz
Approximate Weight632g /22.29 oz
Dimension 326.12 x 95.71 x 9.09mm

Product Highlights

  • Brand: Dell
  • 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 Dell XPS L421x shows the new battery as "unknown" or 0% in Windows right after I installed it — what's happening?

The fuel gauge IC in the L421x reads cell identity and charge state from the battery's EEPROM data. On a fresh replacement, the system has no calibration baseline for the new cell, so Windows reports 0% or "unknown" until it builds one. This is not a fault with the battery or the laptop. Plug in the charger immediately, let it charge uninterrupted to 100%, then run a full discharge to hibernate cutoff — after one complete cycle the fuel gauge IC will read the cell correctly.

Windows is showing my replacement battery at 68Wh but Dell's system info page lists a different Wh rating for this model — is the battery wrong?

The Wh figure Windows displays is pulled from the EEPROM-rated capacity stored in the battery controller, which reflects the cell chemistry and rated capacity of this specific replacement pack (68.08Wh). Dell's documentation sometimes references a different OEM configuration. The actual electrochemical capacity of this cell is 4600mAh at 14.8V — that arithmetic lands at 68.08Wh. If the laptop is charging and the fuel gauge is tracking correctly across cycles, the Wh difference in system info is a data mismatch, not a hardware problem.

The L421x stops charging at 80% and just holds there — is this a faulty battery?

The L421x BIOS includes a firmware-controlled charge threshold that caps charging at 80% when certain power management settings are active. This is a BIOS feature, not a battery fault. Go to Dell Power Manager (or the BIOS power settings under F2 at boot) and check whether "Primary AC Use" or a charge limit mode is enabled — disabling it allows the battery to charge to 100%.

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