PORTER CABLE 20-Volt Max 4.0-Amp Lithium-Ion Battery, PCC685L

I ordered 2 of these from an online eretailer. I would've bought them locally, but, the online price is about half what I would've paid locally, and yes, they ARE genuine Porter Cable batteries. I ordered them for my 761B grinder, but, I'll also use them with my 6 1/2" circular saw (can't remember the # because it's not in my hand right now). These batteries are pretty much required for tools like these. The grinder and saw will eat smaller ones in under 10 mins. Anyway, I charged one of these, then, used my grinder, with a cut off disc, to make A LOT of rough cuts in 1/8" steel diamond plate for a flat bed project. After making about 50 cuts, the battery that I'd charged still had enough juice to clean up the edges for welding. The shortest cuts were about 4"x4", the longest were 6' long and 2' wide. I figured that I'd have to bring out my corded grinder at some point, but, I never did. I considered "aftermarket" batteries, but, I'm glad that I stuck with genuine Porter Cable instead.