Hiya, Summer! Welcome to
planDisney, and thank you so much for stopping by with your question!
While
Walt Disney World does offer ECVs for rent at all four Theme Parks, please keep in mind that they're only available on a first come, first served basis, and prices are always subject to change. If someone in your travel party needs to rent an ECV, I suggest heading to the Theme Parks as early as possible in order to secure one. In the event that they are sold out for the day, you'll also be able to rent a wheelchair.
Once you've rented an ECV or wheelchair, you'll be able to use it for the entire day. However, if you'll be
Park Hopping, you'll need to return your ECV or wheelchair at the front of the park you're leaving, and then pick up a new one using your same receipt at the front of the park you're hopping to. Again, this is completely subject to availability.
Summer, you are also more than welcome to bring your own ECV to the Theme Parks for maximum convenience. This way, you won't have to worry about them selling out!
I hope this helps. If you have any other questions, you know where to find us! Have a magical day!
Warm hugs,
Ana Paula