On certain custom ROMs, they do act as a notification LED. So, that stays on until you turn in the phone. So all you have to is go to Settings>Display>Notification Lights (it will be called something similar) and then turn it off. Some ROMs could have a different way to turn it off. Also, I don't think that you lose battery when they turn on as you click on the buttons.
Cheers! The thanks button is right there... Just saying..
Sent from my GT-I9000 using XDA Premium 4 mobile app
: Samsung Galaxy S i9000 || Samsung Galaxy S3 i9300
: Paranoid Android 4.44 || Paranoid Android 4.44
: Stock PA || Stock PA
: 100-1200 MHZ || 100-1400 MHZ
: OnDemand || OnDemand