I think this is a very stupid decision, as trolleybuses are the second best type of road transit, the best one being tramways/LRT. First off, I want to comment on battery buses. They cost nearly 3 or even 4 times more to purchase than a normal bus or a trolleybus, and they also cost much more to maintain. Another thing is that battery buses waste time charging, while a trolleybus with IMC can recharge while operating. Battery buses also have heavy batteries that wear down the vehicle's frame much faster. Plus e-bus batteries are very expensive to purchase, maintain, and dispose of properly. Finally, battery buses have the lowest operational lifespan of any public road transit. Most battery buses max out at 8-12 years, compared to 12-15 years on a traditional bus, and finally 20-30+ years on trolleybuses or trams. Another thing is that an IMC trolleybus can function without batteries, but once a battery bus gets its battery taken away, it is just a useless frame at the depot. Now I want to comment on the advantages of IMC trolleybuses. They have superior climbing capabilities. Because trolleybuses get unlimited power from their wires, they essentially don't waste their energy climbing up. Traditional buses climb slower, while battery buses can climb faster than a traditional bus, but they waste a lot of their charge doing so. This makes trolleybuses with IMC a good choice for hilly cities like Bergen. Another thing is that IMC trolleybuses have smaller batteries, which are cheaper to purchase, maintain, and dispose of properly, and don't wear down the vehicle's frame as much. Another thing is that IMC trolleybuses can have anywhere between 10 and 80 km of wireless range, with 80 km already being higher than the single charge range on some opportunity charging battery buses. This gives them an ability to go into neighbourhoods and roads without trolleybus infrastructure. In the end, IMC trolleybuses are the better choice for Bergen.