Dell RWFFJ 99.5Wh Battery

Dell RWFFJ Replacement Battery — 99.5Wh, 11.7V, 6-Cell

Keep your Dell XPS 9640 running at peak performance with this high-capacity replacement battery. Engineered for reliability and long life, this 6-cell lithium-ion battery delivers 99.5Wh / 8504mAh of power at 11.7V, ensuring you get extended unplugged usage without compromising performance.

Key Features

• Powerful Capacity: 99.5Wh for all-day productivity and entertainment.

• Stable Performance: Built with premium lithium-ion cells for safe, consistent output.

• Perfect Fit: Designed for seamless installation and compatibility with your Dell XPS laptop.

• Reliable Replacement: Meets or exceeds OEM specifications.

Compatible Dell Laptop Models

• Dell XPS 16 9640

• Dell XPS 9640

• Dell XPS 9640-7097SLV-PUS

OEM Part Numbers Supported

• RWFFJ

• 0J8FK9

• J8FK9

• CN-0J8FK9

Upgrade your worn-out or failing battery with this premium replacement and restore the mobility your Dell XPS was designed for.

Common Laptop Battery Problems That Signal Replacement

• Battery drains unusually fast, even on light use

• Sudden shutdowns at 20–40% remaining charge

• Battery will not charge beyond a certain percentage (e.g. stuck at 60–80%)

• “Battery not detected” or “Plugged in, not charging” errors appear

• Full Charge Capacity is less than 70% of the original Design Capacity

• Battery percentage jumps around or shows inaccurate readings

• Device only runs when connected to AC adapter (battery won’t hold power)

• Laptop feels unusually hot while charging or running on battery

• Physical swelling or bulging of the battery case

• Charging light blinks or fails to stay on consistently