I got my blu advance 5.0 yesterday and it has been charging the entire night and still it's flashing on and off showing that the battery is empty and still charging?....
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Hopefully we can get you sorted.
As belodion said, that definitely doesn't sound right, especially if the battery is below 2,000 mAh in size. Shouldn't take longer than 2 hours at most to charge from 0%.
Are you using the official charger that came in the box? i would try try turning the phone on, restart the phone and then put it back on charge to see if anything changes. If nothing changes, it could just be a faulting charging port on the phone OR the actual charger is faulty.
Does the charger fit any other devices in your house? Maybe try to see if it charges another phone.
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