I was originally looking to buy a Dust Buster type
device but all the consumer ones have built in
rechargeable batteries....such that once the battery
dies you have to throw away the whole unit. Very
wasteful!!

I recently came across many power tool "systems" where
you buy the battery units separate and they can be
slipped on various hand tools such as drill, chop saw,
and hand vacs!

Curious which brand/model is the best value in terms of
light weight, stamina, etc?

Is Li-Ion better than say NiMH?

Any brands to consider such as Black and Decker new GPX
system? Milwaukee's?

I'm only buying the hand vac and battery system for
now..... but since I have no other power tools "might"
need the drill or saw at some point.