Waterpik Cordless Advanced 2.0 charging issue?

Not sure if this is the appropriate sub, but I just got a waterpik cordless and when I put the magnetic charger on it, the pressure setting will light up for a second before going back out. The battery light does not come on.

Is mine defective? I know you need a specific USB wall port for the cable, but I've tried all the ones I have and none seem to do anything different. Help?