The only problem in electric buses is to regularly exchange these battery banks with the charged ones.
For example one of the configuration of the batteries (or cells as they are commonly known) is given below -
Li-polymer cells in 162S4P configuration (162 cells in series and 4 strings in parallel) are used in one battery pack. This is connected to provide an operating voltage of 607.5 V with 80 Ah, and total energy storage capacity of 48.62 kWh.
80 Ah means that if 20 Ampere current is taken from the battery pack for running the bus then it will run for 4 hours only. So after 4 hours it has to be exchanged. Some buses have an emergency pack of same capacity so that after exchange it always have a back up with it.
There could be many other configurations depending upon the size of the bus and load capacity.
Knowledge is power.
These buses are good at controlling atmospheric pollution through these diesel vehicles. We have many electric scooters and battery operated cars. These vehicles will also have rechargeable batteries specially designed for these vehicles. Scooter batteries you can charge in your house in the nights so that day time you can use it.