Both of those cells are unprotect, meaning they can easily (and if one use an UF-brand charger, definitely) over charge. I tried using the 3v one and it murdered 2 Xenon (clone, not SF) lamp assembly, putting each cell at significantly over 3v when charged by a UF charger. I ended up getting a regulated LED lamp assembly so I didn't have to throw away several batteries.
I think there's a more detailed writeup about UF cells and charger over at
http://www.candlepowerforums.com/vb/