Battery life when completely off

[hankscorpio1]

Before I powered down, the battery was at 20%. When I came back 24 hours later, the battery light was flashing and it couldn't power up. So I would like to ask is it possible for the battery to deplete even when its complete turned off or did someone use it?

 

[scout_03]

if the setting put monitor on sleep but leave hdd working that drain battery power,but to be shure that battery is still good charge it

 

[jsc]

If the battery is pretty old - more than a couple of years, that is not unusual behavior.

 

[fortuna]

Self discharge is a known phenomenon for Li-on batteries.. however, 20% in one night seems a bit high. Are you sure your computer was completely shut off? If so, your battery is probably old and needs to be replaced.