A complete charge with a smart brush is not sufficient for a three-ruble note with a voltage of sixty kilovolts. It could have been the marriage of AK&B. After one minute, it switches off when it reaches 10%. Additionally, it is not evident how to charge it on the stand; there are contacts there, but they are not suitable for this battery. Even on AliExpress, there is not an additional battery available for purchase. It takes a long time to charge, about 30 minutes after a full discharge, and it only charges to 4%. In addition, it does an excellent job of vacuuming after a wired philips brush removed from the carpet in the bedroom gathered an additional handful of hair and dust. It is simple to switch out nozzles. Appropriate for use as a backup or for a speedy cleaning during the week. For wired stays once per week.