This is not a grinder for those working on large projects. They require multiple batteries, and even on large projects, they don't last long. I have 3 and couldn't finish the sanding project. So why 5 stars? I knew as mentioned by other reviews that the battery could be the issue, I tested it and will confirm that the battery life is the issue. The reason for the 5 stars is that it's still a great grinder and addition to my tools. I will use it for finishing and small jobs. It doesn't tire my hand while sanding and feels comfortable in my palm. I buy tools from Black and Decker and all the batteries are interchangeable. It's mid-range, but I'm a weekend warrior when it comes to woodworking. I'm sure when I get into something more serious I'll have to find something better, but it works for me. I've attached a stack of lumber that I'm working on to show you how much I could sand in a day using 3 batteries, 8 48" 2x2d and 8 25" 2x2 with 80 grit sandpaper.
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