It's not meant as a challenge. I'm interested in the performance. I built my house in 2004 and had 18V Dewalt accompaniment. I found the batteries then to be ok but not meant for a lot of work. I had drills that were really good but weaker when pounding in lags into wet pressure treated. But lasted all day with screws into Trex. Saw was really a convenience but the battery didn't last long on OSB and 2x was not inspiring.
I sold the old stuff for more than it was probably worth and bought a 24V set of circ saw, recrip saw, light, and 2 drills. The drills are awesome as they should be. I really felt improved power and battery tech with the staying power on the recrip saw and circ saw. Big difference. My needs are too large for a battery weed wacker but I read a lot of the battery-operated mowers and trimmers and wonder.....
I also question the battery cost. DeWalt hosed everyone with the 18V system by ensuring replacement batteries were almost as costly as they were when the 18V system first came out. That battery replacement made it more cost effective to buy the new 24V than replace a few 18V batteries for what I already owned.