The differences between red battery chair and yellow battery chair are listed in thedetails section highlighted in red. The main difference is the load limit on the red battery chairs is 440lbs and the yellow battery chair is 400 lbs. The red battery chair has larger 10-inch rear wheels and 5-inch front wheels to provide better transportation over rougher surfaces. In addition, the tubular frame is slightly thicker providing more stability. There are other important enhanced features you can see on the website. If you need more specific information, please email us at info@line2design.com.