You can do it another way around too. Just make sure no north on top of both fingers, or south on top of both finger. Please don't post anything under here. This bulletin board has been redesigned not to accept secondary postings. I didn't think that, after the rings had been correctly constructed, it mattered which side up one kept the rings around the fingers.
Cells are diodes.
Electrons only go one way. If you have both poles turned north, that will stop the traffic and will damage your health. You can do it another way around too. Just make sure no north on top of both fingers, or south on top of both finger.