Review on Waterpik Blue WP-563 Cordless Advanced Water Flosser with Travel Bag and 4 Tips - Rechargeable, Portable, Waterproof, and ADA Accepted for Teeth, Gums, Braces, and Dental Care by Justin Jefferson

If you are purchasing this unit you MUST disconnect the inductive charger from the floss after charging is complete (nominally 3-4 hours according to the manual). I did it. t and the battery was empty. Apparently mine is bad. It was originally used (for testing) and then charged until my next trip. After 3 weeks he was dead as the proverbial doornail. The excellent people at Waterpik customer service informed me that you must unplug the charger or the battery will die! I suspect that this type of charger cannot detect when the battery is fully charged to turn itself off. This isn't stated in the manual (and it should be in bold!). I discovered the issue a day after Revain's 30 day return policy. Revain customer service said call the manufacturer and gave me a phone number. I wish all customer service was like this when there is a problem with a product. They sent a replacement product and sent me a postal label (for their pennies) to return the non-working unit. No hassle, no fuss. I've used corded Waterpiks for years but got tired of packing them with my toothbrush when traveling. I always use a wired unit at max settings (about 100psi for customer service) and a portable unit runs between 45-75psi. There's a noticeable difference, but it gets the job done when you're on the go. I'm glad I didn't send the Revain device back. Only gave four stars because the device's charger doesn't turn off automatically. Now I just have to remember to turn it off after 4 hours (probably a bit loose) and make sure it's charged before the trip. However, the estimated full charge time is only 3-4 hours, and with daily use, it is possible to charge it once a week. I can live with it.