Battery MITSU B31N1726 for ASUS FX504 FX505 FX80G 3900mAh 44Wh 11.4V

Rechargeable laptop battery MITSU B31N1726 is compatible with ASUS FX504, FX505 and FX80G series and provides a nominal capacity of 3900 mAh (44 Wh) at 11.4 V. Designed as a replacement for original B31N1726 cells, this battery is intended to restore portable power to supported laptop models and extend runtime for everyday activities such as web browsing, office work and light multimedia playback.

Advantages

The MITSU B31N1726 battery offers a direct-fit replacement form factor and matching nominal voltage to work with specified ASUS models. With a rated 3900 mAh (44 Wh) capacity, it is intended to deliver consistent power for typical mobile tasks and moderate multi‑tasking. The battery is rechargeable and designed for straightforward installation in compatible laptop housings.

Suitable for

When it may not be suitable

This battery may not be suitable for laptops other than the specified ASUS FX504, FX505 and FX80G models; physical fit and electrical compatibility are limited to compatible models. It is not intended for uses requiring higher capacity or extended endurance beyond the rated 3900 mAh (44 Wh), nor as a substitute for batteries with a different nominal voltage.

Key specifications

How to use

Power down the laptop and disconnect any external power sources before starting. Remove the existing battery following the laptop manufacturer's instructions or service guide, then install the MITSU B31N1726 pack into the battery compartment ensuring proper alignment and secure connection. After installation, charge the battery fully using the laptop's original charger or compatible power adapter before first use. Observe standard battery handling precautions such as avoiding exposure to extreme heat, physical damage, or liquids.

What to consider before purchase

Recommendations

Charge the battery fully before first use and perform regular charge cycles to maintain capacity. Store the battery at moderate temperatures and avoid prolonged exposure to high heat. If the battery swells, shows signs of damage, or does not hold charge, discontinue use and replace it with an appropriate compatible pack.