I use a handheld cordless circular saw--Makita 6 1/2" 18V brushless. These types of saws are in their 3rd or 4th generation. 6 1/2" isn't very big, but there ar

I use a handheld cordless circular saw--Makita 6 1/2" 18V brushless. These types of saws are in their 3rd or 4th generation. 6 1/2" isn't very big, but there are larger ones with 36V packs. I can't imagine the corded, handheld circular saw market lasting much longer. I know they're much more expensive (~3x excluding battery), but cordless is infinitely more convenient. Cordless chainsaws have been out for awhile, too, though perhaps until recently they lacked the necessary power and duration for professional work.