Since then, I have not observed any variations in the level of performance. I put it through its paces as a grinder and on occasion put it to use for cleaning. I started by purchasing a screwdriver that came with a charger and two batteries for 5A, and then I added a bare angle grinder carcass to it. I did this because I didn't want to have to buy and carry around two luggage, two chargers, and four batteries, because money is a source of worry. At first, I contemplated bringing an electric screwdriver powered by two-ampere-hour batteries; the vendors gave sound advice and informed me that the batteries would only last for a few minutes when used with an angle grinder. I experimented with cutting with a disk, stripping, and just buzzing at idle with frequent replacement of cut parts, and I did not detect any difference in the battery life of the 5A tool regardless of the mode or load. 5A batteries have an average lifespan of around 20 minutes of operation, and the mode and load have almost no effect on the running duration. I use cutting discs with a thickness of 1-1.2 mm. It is a very interesting experience to work with no strings attached and with power there, yet there are times when it is vital for work. Absolutely delighted with the transaction that I made!