I had to rent an
ECV for our last trip bc I had a bad ankle. I rented from Walker Mobility. They are not Disney Approved vendors but they were very helpful on the phone and the scooter lasted a long time. I always carried my charger with me into the parks just in case I needed it (which I never did). Just make sure if you are waiting for a parade or waiting in a line for a ride that you shut the ECV off to preserve the battery power. I used the ECV all over the place. We were staying at the Grand and the monorail system was down so we walked from the grand to the poly for a breakfast reservation and then walked from the poly to the TTC to hop on a bus to take up to Epcot and then stayed in epcot pretty much the whole day. Thats a long day! I was almost at the end of my battery power when we were heading home but I never once felt like I was going to run out, just was low thats all. I think most
ECVs that you rent as long as you are cautious with the battery power they should last all day. Also don't forget to recharge them at night too.