I couldn't try or test the battery until I fix up my charger connection problem. Today I tried the battery bought from AUS warehouse few weeks ago, it turned out unbalanced cells. cell 3 has 0.2v less than others. It stopped charging at 4.06v. I returned one of the batteries from AUS warehouse the second day after I bought it. it was an flightmax 4s1p 5000mah battery. It was a puffed faulty battery. I've reached to a conclusion that : 1. Guys from AUS warehouse hardly check the batteries they send. 2. Batteries from AUS warehouse have a high chance of being faulty.