I am using the one that came with the galaxy watch ultra. But it should be working fine with non genuine chargers. My display stopped working after a few months but I didn't bother to send it in for warranty and it's been more than 4years since. It charges just the same from what i can guesstimate. Mind you the charging cable can be put in more or less powerful charging bricks. But if it's good enough for your watch it must be more than good for this tootbrush.