Fancy Buying LK03XL Battery for HP Envy X360 55.8Wh

Fancy Buying LK03XL is a brand-new 3-cell Li-ion replacement battery designed to restore power to compatible HP Envy X360 and Pavilion X360 laptops with a nominal voltage of 11.55V and a capacity of 55.8Wh.

If your HP convertible or 17-inch Envy is running shorter on battery life or refuses to power on without the adapter, this Fancy Buying LK03XL battery offers a direct-fit aftermarket option. It’s built from high-quality cells with a smart protection circuit and comes with certifications for safety and environmental compliance. The pack replaces many HP part numbers and works across a broad set of 15- and 17-inch Envy and Pavilion X360 models, making it a practical, cost-effective repair choice.

Which laptop models and part numbers does this replace?

This pack is engineered to match HP part numbers and fit a wide group of Envy X360 and Pavilion X360 machines. It lists numerous OEM references and covers both 15-inch and 17-inch convertible families, so you can usually swap it in without hardware modification.

• Direct compatibility: LK03XL, LKO3XL, LK03048XL and related HP references such as 916368-421, 916368-541, 916814-855.
• Also replaces HSTNN-LB7U, HSTNN-LB8J, HSTNN-UB71 and similar HP service numbers.
• Fits HP Envy X360 15-series and many 17-series models plus select Pavilion X360 15-cr variants.

How does the battery perform and what are the specifications?

The Fancy Buying LK03XL is a 3-cell lithium-ion pack rated at 11.55 volts and 55.8 watt-hours. It’s assembled with quality control on the cells and a built-in smart chip to manage charging and discharge. While actual runtime depends on your configuration and usage, the cell chemistry and capacity match OEM expectations for these HP systems.

• Specification: 11.55V, 55.8Wh, 3-cell Li-ion chemistry.
• Built-in protection circuitry to help prevent overcharge, over-discharge, and short circuits.
• Brand-new condition with high-quality materials and top circuit boards.

Is it safe and how is compatibility verified?

Safety features and certifications reduce the risk of faults and make the battery suitable for everyday laptop use when installed correctly. Fancy Buying follows compatibility checks and tests packs to meet common safety standards, and the unit includes a protective circuit that works with HP charging systems.

• Certified to CE and FCC standards for electrical safety and electromagnetic compatibility.
• Includes internal smart chip and circuit protection for stable operation.
• Tested for fit and function against listed HP part numbers and model families.

What should I expect during installation and early use?

Installation is a straightforward swap for technicians or experienced users familiar with laptop battery replacement: remove the service cover or bottom panel, disconnect the old pack, and secure the new one. After installation, calibrate the battery indicator with a full charge-discharge cycle for optimal reporting accuracy.

• Turn off the laptop and unplug the adapter before replacing the battery.
• Disconnect the internal battery cable carefully and fasten the new pack in place.
• First-use tip: charge to full and allow one full discharge-charge cycle to stabilize battery reporting.

Who is this for? Fancy Buying’s LK03XL battery is intended for owners of compatible HP Envy X360 and Pavilion X360 laptops who need a reliable, direct-replacement battery without the OEM price tag. It’s suitable for IT technicians, repair shops, and informed consumers comfortable with internal laptop maintenance who want a certified aftermarket option that restores portable use and extends the device’s service life.