I use a Nitecore Digicharger D4 for all of my rechargeables. For 18650s specifically, I use Panasonic NCR18650B batteries with what I'd call a flattened button on the positive end. These were/are on eBay from a private seller, and if I could remember who, I'd let you know. The Panasonics are highly regarded and these last a long time.
I use the Panasonics for modded Sure Fire Fury lights used in dedicated WML or hand-held roles. I've had zero issues with these and would buy both those types of 18650s and the charger again without hesitation. FWIW, I also use some 18490s I received with a used light I bought on another forum. These are 3.7V, 1100mAh (4.1WH) and I've been using these (x2) on a more or less experimental basis in another Fury mounted as a WML. These are the same diameter as the 18650s, just shorter, so no spacer is required.
Hope this helps-
Pat
Where violence is the local language, be fluent.
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