I wonder how EVs really compare to trolleybuses (tech from XX century) pollution and money-wise?

EVs have more route flexibility, and don't need expensive infrastructure, but they need expensive (and polluting) batteries and spend idle time charging.

The city I live in ponders EV-Trolleybus hybrid. I can routinely see them minding their business with poles down. Still I'm not really sure if they'll waste a lot of time manually setting it up and down and whether pure EV is a better idea.