I might have started this Panasonic thing, via the Chat room.
I'm not saying it's wrong, Panasonic make some bloody good drill units and other tools and the battery units don't bugger up after a few charges, no matter how much you abuse them.
Panasonic was the first company to use NiMh batteries.
My 12V NiMH batteries are still going strong and I can still driil through a power pole (300mm) with an Auger bit, at least 3 or 4 times.
Auger bit being 1".
At the end of the day, it is the drill motor and battery that makes the difference.
Some manufacturers should be ashamed to put what they call motors in thier drills.
Brushes?, get real!.