dmjlambert:
If it has 13 or 14 volts that may be too high. Since those Tiny85 boards are very cheap, you would not be risking very much by experimenting.
I imagine that at 12.6 it would still be to high ? I'd butter use a UPS battery. I got one all ready to go and they are 12.4 fully charged. I can drain it a bit before resetting the fuse.
Thank you, really informative.
Sid