The difference in those two batteries is the width. Most chargers would charge both.
With the 18490 you would get about twice the use time.
I must say that the little, tiny, Mini Woodvil is a wonder to see. I love my 18490s but they are chubby! The Mini Woodvil is made with the same perfection as the much larger Woodvil. It amazes me that it can be made to hit the same as the larger Woodvil.
My 8 Mini Woodvils are my miniature wood REO's.


