Whats the difference between a personal blender and a true portable blender?

Personal blenders (like the nutribullet and Magic Bullet) use a corded countertop base with to-go cups, so they are 'portable' mainly in that you drink from the same vessel you blend in. True portable blenders are cordless, USB-C rechargeable, and meant to be used away from an outlet. The cordless models trade raw power for go-anywhere convenience.