I just purchased a new CF G-power battery. It is an 1100 mHa unit rated at 4.2V. I was going to charge it before use. I am using a USB charger from my eGo-T battery rated at 5V input with an output of 4.2V-420 mHa. The red led on the charger comes on, the battery lights flash three times but they then go out. They do not stay on as the manual says they are supposed to. Can you tell me if I’m using the wrong charger or is there a problem with the unit.