Check out this recent thread: https://www.talkphotography.co.uk/threads/aa-battery-charger.653468/
http://www.ebay.co.uk/itm/Nitecore-...905002?hash=item1a28b204ea:g:yJAAAOSwuLZY291K
This looks like a good one for the money ..
I got sort of curious about the 18650s when I bought the 7dayshop MultiSmart 3000, which also charges them (linked in the other thread, but currently out of stock). It does look like a good choice for a torch - you can apparently get 1000 lumens from a single 18650 in a very compact package. Possibly my next new toy.