I guess you could always try it both ways and see. (But if 4.2 is good, wouldn't 4.8 be better?)
One of my (4) Spinners has stopped charging. I thought I'd ask if there was anything I should poke or prod before I just throw it out. The battery is only 4-5 weeks old. When I plug it into the charger, it doesn't acknowledge that it's been plugged in. (ie no lights, etc.)
Might be the pin has been pushed down too far to make a connection to the charger. Use a small, stiff implement to gently wiggle up around it. If you get a tiny bit upward motion, it might make contact. It's not an unusual issue with them. Not all toppers have precisely the same dimensions, and its easy to overtighten them.
Uh, you didn't inadvertently turn it off, did you? 5-clicks? Or did it shut down due to low voltage?