Battery Green Cell AS77ULTRA for ASUS A450 A550 F550 K550 R510 X450 X550

The Green Cell AS77ULTRA battery is a replacement power unit designed for compatible ASUS laptop models including A450, A550, F550, K550, R510, X450 and X550. Manufactured using Lithium‑Ion technology, this 3400 mAh black battery restores mobile power for daily computing tasks and offers a balance of capacity and compact form factor to fit the original mounting points and connectors of supported notebooks.

Advantages

The battery provides stable voltage and consistent performance through typical charge cycles, helping to maintain predictable runtime for office work, web browsing and multimedia playback. Its Li‑Ion chemistry ensures a favorable energy density while keeping weight and size suitable for portable use. The battery is produced to match mechanical and electrical specifications of the compatible laptop models so it fits without modification.

Suitable for

• Replacing a worn or failed battery in supported ASUS laptop models
• Extending mobile runtime for everyday productivity tasks
• Maintaining portable power for travel, study, or remote work
• Servicing refurbished laptops where original battery performance is reduced

Key specifications

• Battery technology: Lithium‑Ion (Li‑Ion)
• Nominal capacity: 3400 mAh
• Colour: Black
• Form factor: Replaceable internal laptop battery compatible with specified ASUS models

How to use

Before installation, power off the laptop and remove any external power source. Follow the laptop manufacturer's service instructions to access the internal battery compartment, disconnect the old battery connector, and remove the battery module. Install the Green Cell AS77ULTRA in the same orientation, connect the battery cable securely, and reassemble the laptop. After first installation, charge the battery fully before normal use to calibrate charge reporting. Observe standard safety precautions when handling Li‑Ion batteries.

Recommendations

Store and use the battery at moderate temperatures, avoid exposure to high heat or moisture, and do not subject the battery to impact or disassembly. For prolonged storage, keep the battery charged to approximately 40–60% and check charge periodically. If you notice abnormal heating, swelling, or performance degradation, discontinue use and replace the battery.