Wish I had waited ten years before my last hand grinder purchase it would likely use Lithium batteries rather than the Ni-MH which my rechargeable uses. I have five hand grinders as is and the rechargeable gets the least use as all my work stations have 120ac available except the boat. So I will take your word for how great the lithium powered grinders are. I do admit to the place a cordless grinder truly shines. In the middle of the layout where the trees once were. I've likely purchased my last hand grinder. Though if it makes you happy I'll turn green. Same shade as when I saw your new scope. ShowOff ! j
Yep, I think the battery technology has really made a difference in power tools. I have a number of friends in the construction trades, and they all have a huge assortment of battery powered tools. I had an older Dremel with the NiMh battery, and it was totally unimpressive. However, after I bought a Milwaukee 18V Lithium drill and impact driver, I was sold on battery power! When I need a drill, I can't remember the last time I used a corded model, but I think it was my close quarters drill as the Milwaukee wouldn't fit between the studs. When I saw the Dremel 8220 at a friend's house and tried it, I was totally sold. Between the Dremel 8220 and my Dewalt Gyroscopic Driver, those are the power tools that get the most use from me.
One thing with battery powered tools. Don't even think about the ones that don't have a removable battery! Having the ability to pop the spare battery in while the other one charges is key to the total convenience of battery power. All my battery powered tools have at least two batteries, and I have three for the power screwdriver, that one really gets a workout.