Works as well as the $100 dollar one I had from the big name company, that finally petered out. They build em so replacing just the battery is expensive and they make it as hard as possible where you must solder a new one in. So rather than spend all that I tried this one! NICE!
IF you think this one is running out of power, fact is you are pushing it too hard against your teeth, and it can't work as well as intended that way either. Only thing I would do is put a touch of rubber over the toothbrush part because if it touches your teeth it will let you know!
Used maybe 20 times now and still doesn't need to be recharged. Stands up fine by itself on flat base.
So far this seems to be a good value and a good electric brush!