The triton tank will not fit on a 510/ego battery with any adapter that I know of. If you like that style of tank, it is nearly identical to a Kanger T2 (which ironically does fit on the triton battery or a standard ego). Both the trton tank and the T2 use the same heads.
An 808 to ego connector will not work. Unfortunately, although the triton tank uses the ego (outer) threads, the center post just does not extend enough to make contact on a 510/ego connector.
An 808 to 510 connector will not work because the triton uses the ego threads.
Sorry.