Since then, I haven't observed any modifications in performance. I grind things with it and occasionally clean with it. Then I took a naked angle grinder carcass to it since I didn't want to buy and carry two luggage, two chargers, and four batteries, and because money is stressful. First, I used a screwdriver complete with a charger and two batteries for 5A. The vendors gave me good advice when I initially planned to bring a screwdriver with 2A batteries, telling me that they would last for a few minutes on the angle grinder. I tried cutting with a disk, stripping, and just buzzing at idle with frequent replacement of cut portions, but I did not detect a difference. 5A batteries endure an average of approximately 20 minutes of operation, and the mode and load have absolutely no influence. I use discs with a thickness of 1-1.2 mm. Working with electricity and no string is incredibly cool, and occasionally it is required for work. I am totally happy with my buy!