I have not used the item yet. However, I am a little that there is no way to purchase a backup battery from the seller. Nor do they have any knowledge of where I can get an exact backup battery. So, without a backup battery goes dead, I have to wait anywhere from 2.5 to 6 hours for the battery to completely charge again. Which time is money in the construction field. I've took it upon myself to search different batteries, to see if one would fit and have had no such luck. I'm seriously debating on returning it. And purchasing a known osolating tool that comes with multiple options.