Waterpik WP-360 Cordless Dental System Water Jet

I used this twice a day. Worked great for 4 months. Then over the next 3 months the battery charge lasted less and less time. Now it is totally dead. Great design, poor battery quality. I will not be buying another to replace it.

Cordless Dental System Water Jet * Convenient, hand held design * Rechargeable, no batteries needed * Clinically proven to fight gingivitis * Promotes healthy gums and healthy smile * Lightweight, space saving design * 2 Low pressure tips for gentle cleaning * 2 high pressure tips for deep cleaning * Tips rotate 360 degrees to reach all areas of the mouth * Easy-to-fill flip top reservoir * Stays charged for approximately 1 week, depending on use Model. WP360