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Because they are a bit like some of the dedicated Lithium batteries that come with power tools. I would guess they are pretty expensive

Thought as much. Spare Lithium is aprox $60 us$ I believe

No Gibo. It is a separate AA battery pack that replaces/backs up the lithiums should you need it.
For instance, if you were on an extended trip and could not recharge the lithiums then you switch...

I dont use a rino myself, but a couple of mates have them. They have yet to need the back up battery pack as they are getting great useage from the lithium rechargeable.
One point to note is that...