I don't know what electrical power outlets in Canada are like, but I think Canada uses the same type of outlets as the US.
The parts I bolded are not possible in the US - regular outlets are 120 Volts and 60 Hertz. (The US also has 220 Volt outlets, but those are only for specific dedicated use for electric dryers and electric stoves).
It's possible that Disneyland may have disconnected some outlets that they no longer needed.
It's not possible to 'turn down the current'. If the outlet is active, it is giving the same amount of power. Phone power charger cords use the same outlets as power charger cords for wheelchairs.
Since your battery was charging, just slow, the problem would likely be either with your battery or your charger, not the outlet. It is possible for power outlets to be 'loose' and not giving a good connection (that happens when people pull a cord out by the cord rather than the plug). But, usually, we notice that because the outlet feels 'wiggly' when plugging in.
There is no requirement for any business to provide a place for customers/guests to charge equipment, even mobility equipment. There is also no requirement for them to provide a replacement for a customer/guest to use while charging their own.
While it would be nice for DL to provide charging stations for ECVs, those are courtesies, not requirements.
So, I guess the important things to keep in mind are not to count on being able to charge equipment and making sure batteries are functioning well before going on a trip.
Yes you are right. Money was tight due to a few major unexpected expenses. So I did make the choice to go with weaker batteries or not go. I will not be doing that again.
I know nothing about ADA laws so I do not no what is required or not. I just go with what I think is more reasonable. So I think this post is done. No need to hash it out anymore.