The vanson works well and you can charge 1 battery or different types at the same time. Sanyo's from Battery Junction, the 2700 seem to work fine, but I have several kinds and truthfully they all seem to do the job if properly charged.

http://www.batteryjunction.com/vabcunsmch.html.

Trust me choosing the flashlight was the easy part. All seem to do the job except those cheap quick charge types from Duracell or Energizer.