Fancy Buying B21N1329 Laptop Battery for Asus X403 X453 X553

Fancy Buying's B21N1329 is a 7.6V, 30Wh Li-ion replacement battery built to restore power to compatible Asus notebooks including X403, X453 and X553 series.

If your Asus laptop is shutting down early, not charging fully, or showing degraded battery health, this Fancy Buying replacement battery is a direct-fit alternative to restore usable runtime. Designed as a compatible swap for part numbers such as B21N1329 and 0B200-00840000, the pack is manufactured to meet standard safety certifications and undergoes electrical testing before shipping. It’s a straightforward way to bring back portable productivity without buying a new machine.

Which Asus models will this battery work with?

This battery is made to match form factor and connector specifications on a range of compact Asus models. Confirm your laptop’s existing battery label lists B21N1329 or matches one of the listed model families to ensure compatibility.

• Fits: Asus X403, X403M, X403MA, X503M, X502CA
• Also fits: X453, X453M, X453MA, X553, X553M, X553MA
• Compatible with additional models: F453, F453MA, F553M, S400, P553

How long will the battery last and what is its capacity?

The pack provides 7.6 volts and a 30Wh (watt-hour) capacity, delivering practical runtime for light to moderate everyday tasks. Expected lifecycle is around 500 charge cycles under normal conditions, after which capacity gradually decreases.

• Nominal voltage: 7.6V for system compatibility
• Energy capacity: 30Wh for typical web, office, and media use
• Cycle life: roughly 500 recharges with gradual wear

Is the Fancy Buying replacement battery safe to use?

Safety and quality checks are part of the manufacturing process, including voltage and circuit protection tests. The battery is designed with low self-discharge in mind and carries common safety certifications to meet consumer product standards.

• Cell type: Li-ion with built-in circuit protection
• Certifications: CE, FCC, RoHS compliant
• Quality control: tested for correct voltage and stable output

How do I install the replacement battery and what should I watch for?

Installation is generally a simple swap if your model has an internal removable battery accessed through the bottom panel. Power down the laptop, remove the old pack carefully, align the connector, and secure the new battery in place. Always follow your laptop manufacturer’s disassembly guidance to avoid damaging internal components.

• Power off and unplug before beginning installation
• Match connector orientation and mounting points exactly
• Recalibrate battery in OS if required to restore accurate charge reporting

Who is this for: The Fancy Buying B21N1329 battery is aimed at owners of compatible Asus X403/X453/X553-family laptops who need an affordable, tested replacement pack to extend usable life. It suits students, professionals, and anyone who wants a cost-effective repair option rather than replacing the entire laptop. If your laptop model and part number match the list above and you can safely swap internal batteries, this product gives a straightforward power refresh with standard safety features and predictable cycle life.