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..
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: Samsung Galaxy S i9000 (Not exactly with me) || Samsung Galaxy S3 i9300
: Paranoid Android 4.5 B3 || Paranoid Android 4.6 B1/Paranoid Android 4.6 B1 [Dual]
: Arrow (TWRP) || Googy-Max 2.3.2 (Devil touch Recovery)
: 100-1200 MHZ || 100-1400 MHZ
: OnDemand || OnDemand