Am I doing something wrong? I have lost 2 510 batteries this week. i am down to one now and I am going crazy. The 1st battery goes on the charger never turns green like it is charged. So it is just not accepting a charge at all. The second battery is a 51o mega and I charge it and when I press the button the led lights up but nothing happens.. I just bought the kit 35 days ago. Why is this happening ? Am I doing something wrong? I have the charger that came with the kit and I bought a usb charger. I do not have the money to be going through batteries like this. Can anyone shed some light on this for me?