Can You Use A Power Bank With Nintendo Switch. The Nintendo Switch has a USB-C port but that doesnt mean that your power bank has to have one. I hope it helps.

If you already own a USB-A power bank then by all means give it a go. Also I think usb c negotiates the power there fire even if you used more power than necessary to charge your switch then usb c cable interface would adjust. To add some users have commented that their non-PD power banks are able to let them charge and play at the same time.
Only USB-PD Power Delivery devices chargers and powerbanks works in fast-charging the Switch.
There have been problems with third party docks. This was while playing Zelda in portable mode at maximum brightness maximum volume with WiFi on. Second you need to use a power bank that has more internal charge than the Switchs 4310mAh battery considerably more if you hope to power up the console more than once. If you look at the Nintendo Switch car chargers.

