GotVapes in the US calls it an eGo Variable Voltage 3 Stage 510 Battery. I don't know who sells it outside of the States though. Internationally it goes by KSD-639 (according to a quick Google search).
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I'll bet that Kanger is the manufacturer if it starts with a "K" model.
(i.e. KR-808D-1) for example.
I too have never seen this model....very nice!