I bought this toothbrush to replace another vibrating (non-rotating) toothbrush. I haven't found any problems with this. The USB charging port is under a screw cap on the end and I fully charged it before using it. It wasn't weak. Actually, I found it a bit aggressive. The included leaflet states that the charge should last 30 days. The toothbrush comes with 9 brush heads that are said to last 3 months. So 2 years 3 months. I agree as the lifespan of the toothbrush has been so long since my last one. The only drawback is the small brush head. I have a small mouth so this works for me. It's also easier to maneuver. I also try to keep the bottom half as dry as possible. I don't know how all buttons stand up to time and moisture. I bought it at a discount. I wouldn't pay $80 for that.
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