Eugene, yeah, flashlight people call alkalines "alkaleaks" and advise against them. I haven't had leak probs so far with eneloops or lithiums. Eneloops in particular (that specific brand, not that type of cell in general) seem to have very good charge retention, like 5+ years. So they're almost always preferable to alkaleaks in those formats, with lithium primaries available for some special purposes (super light, cold weather etc).
While I have not had an lithium or eneloop leak, but did have a off brand NiMH and Radio Shack NiMH leak in the past. So I lean toward the "anything is possible" and try to be sure to store separate no matter what kind of battery it has.
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