My old VersaPak tools are wearing out and I'm looking for cordless replacements. Of course, I dread adding even more proprietary batteries and chargers. (The only other compact batteries I currently have are Bosch 12V for the PS41-2A drill/driver.) I haven't found one brand that can replace inline screwdrivers and 1/8" rotary tools with a single battery geometry. I have a lot of heaver tools, but really like the convenience of these light-duty ones without a big battery bulge.
Has anyone found a reliable mainstream "skinny battery" tool series that includes both of these options? If I strike out, what non-replaceable battery systems should I look at (all tools must work with the same charger.)