hey guys. i just charged my liIon battery and its charged to 4,2 volt blue light come on . i checked the voltahe it was 4,2 volts and when i dis connected the battery it drop to 4,01 and stayed there what is happening. is it because its lost some of its capacity in time or what why is it doing that my other battery doesnt o that its just stays at 4,2 v even when its not connected to anything (charger etc.) i mean does open curcuit voltage of liIon battery drops even fully charged when its ages and lost its capacity? please answer me thank you.