I can understand these being operated as experiments, but not as regular buses. They aren’t ready yet.
There were ready, and operational in the early 1900s.
I have a repair manual for them.
They used Nickel iron "Edison" batteries that required no charge controller, and improved with age.
You couldn't over charge them, and completely discharging them didn't harm them.
Those simple, rugged batteries are finally now being produced in the USA again, and sold by Iron Edison.
If we want electric busses and trucks, should just dig out the old prints and patents on the ones proven to work.
Throw on modern safety and control equipment, and you have a cheap, reliable bus or truck.
They make sense in cities, useless in the wide open spaces.