Battery does not work! I have several other 20 volt tools, a hammer drill and an angle grinder, both work great. When I needed a new grinder, why not, I already have 2 batteries: one 2Ah and one 4Ah. I had a piece of 18x30, to grind from 220 to 2000 I had to sit at the charger and keep changing batteries. 4ah was about 10 minutes long and 2ah was, well, not that long. When you return, you'll get a corded grinder that's never fit for real work. Yes, and it's very heavy with a 4Ah battery.