I just got my new MX900. When I try to get the mouse to charge, I never get a blinking or solid green light, just the blinking red light. The mouse works fine with Alkaline batteries. Will not charge with other (energizer) NM-HD batteries. The base is plugged into the power adapter. I have tried with the base in and out of a usb port, in a hub and directly in my laptop. Am I missing something, or do I have a defective base? Thanks for the replies.