USB charging outlets are now available on many buses in Stockholm area, the service is testing now and will be implemented more if successful. So why do we need USB charging on public transport in the first place? Ah, because Apple iPhone has such a bad battery life.
Interesting how a big city like Stockholm is adopting and offer help to support a bad design implementation from large multinational companies.
Not so important for the smart people who buy mobile phones where you can swap out and replace with a full battery.