Bests & Worsts Reviews from Amazon

If you buy this unit you MUST disconnect the inductance charger from the flosser after charge is complete (nominally 3-4 hours per the manual). I didn't and the battery failed.My bad apparently. It was initially used (to test it out) and then left on charge until my next trip. After 3 weeks, it was dead as the proverbial doornail. The outstanding folks at Waterpik Customer Service informed me that you have to disconnect the charger or the battery WILL fail! I'm guessing that type of charger can't detect when the battery is fully charged to turn itself off. It is not specified in the manual (and it should be in bold print!).. I discovered the issue 1 day after the 30 day return period to Amazon. Amazon Customer Service said call the manufacturer and gave me the number. I wish all customer service was like this when there are product issues. They transshipped a replacement product and are sending me a mailing label (on their dime) to return the non-functioning unit. No hassle, no fuss. I've used corded Waterpiks for years but got tired of packing it with my toothbrush when I travel. I always run the corded unit on max setting (about 100psi per customer service) and portable unit runs anywhere from 45-75 psi. There's a noticeable difference, but it gets the job done when you're on the road. I'm glad I didn't return the unit to Amazon. Only gave four stars since the unit charger will not automatically turn itself off. Now I just have to remember to turn it off after 4 hours (probably some slack there) and ensure it's charged before I travel. However, estimated time to fully charge is only 3-4 hours and if used daily, maybe charge it once a week. I can live with that.