MaDsCiEnTiSt22
Active Member
the wf-188 says no spacers required....I'd recommend sticking with the '188, especially if you want or need to charge 3v cells (e.g. LiFePO4 RCR123a). Also there's no slow charge setting - it is only a "fast charger" - Your cells may not last as long and smaller capacity batteries (e.g. the 14250s for the Omi HVD) may not be happy (the '188 has a lower current setting available for these). Finally, I think you're confused about the USB ; It is a 5v/1A output, not power input - i.e. you can NOT operate it from a laptop or car, but rather it can supply power to a separate "USB charger".
Then there's this year old review/post (translated):
http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http://www.taschenlampen-forum.de/ladegeraete/10958-ultrafire-wf-200-2-schacht-lader-usb-ausgang.html
The '188 works great for me, except using spacers is a PITA as they tend to fall/pop out.
-NDA