Hi everyone, I have a problem with my aspire cf vv+ battery. When I try to charge it everything seems fine expect that after the light on the button turns from red to blue, the red light on the charger starts blinking very fast from red to green every 4-5 seconds and the charge seems to never finish even in hours(The light on the battery remains blue and doesn't turn off and the light on the charger keeps blinking from red to green once a few seconds).
The charger that I'm using has these specs:
Input: DC 5V
Output: DC 4.2V 420mA
EDIT: The charger is not its original charger, I had to change it, but I picked one with the same specs.