Believe me I have been in this boat when my
ECV was unplugged one night because a little guy wanted to play with it, unbeknownst to me, and he did not plug it back in...

Then the following visit I had dud batteries that had to be replaced...
Also if you go out really early and stay really late, then you may need a recharge... depending on how many miles you put on your ECV and if you are riding flat or doing a lot of inclines, etc.
I can tell you that there are plugs in all of the restrooms, and sometimes beside them.
If you look at the base of the big silver light poles, most of them have plugs... some have little silver covers over the plugs that are on a hinge that flip up.
Many restaurants also have plugs, where you can put your ECV during lunch or dinner.
Do not attempt to use the plug at the Garden Grill... The floor moves... the plug does not...

(I did not use the plug... but my bf thought about asking to plug it in until I pointed this out to him)
Do not use the plugs at Fantasmic as there could be power surges due to the show.... and in that same thread, if you feel that you may have to plug your ECV in at the parks, you may want to carry a surge protector with extension because sometimes the plug is located beside or next to an object that cannot be moved or in an inconvenient place to park... Just ensure that the cord is not in a walk pathway where it can be tripped over...
Chances are you will not have to recharge while in the parks, but if you do it can be done.
Take care.