Zorba - I'm curious how much you think the Milwaukee cordless tools and batteries weigh? I just weighed a few of mine:
M18 1/4" Impact Driver (#2760-20) - 2.3 lb (no battery)
M18 1/2" Drill (#2801-20) - 2.5 lb (no battery)
M18 CP2.0 Battery - .9 lb
M18 XC5.0 Battery - 1.6 lb
If you put the XC5.0 battery on the drill above, it's just over 4 lb, and the balance in hand is very good. I'm curious how that drill above compares in weight, and I know it doesn't balance in hand as well with all the weight on one end of the handle...
I only use my tools nights and weekends because my day job is at a desk, but I do a LOT of weekend work with these, and I would say once every 3-4 weeks I swap a battery out for the most routine stuff like maintenance work. However, there are certain tools that do eat up the amp-hours, usually when fabricating. Cutting with a recip saw, jig saw, or cutoff wheel, or drilling big holes can require multiple batteries to do a job. For me, the convenience of not dealing with a cord trumps the few battery changes I have to do.