Can I simply migrate content from Bitwarden to Vaultwarden?

I couldn’t tell from looking at the faq or wiki.

Does anyone have a handy guide to switching to selfhosted version? I was considering doing that but I let my plan renew out of laziness.

How do you measure power draw?

I have a new to me device that I installed postmarket on. I’m at the step of deciding how cooked the battery is or if something is wrong on the software side.