Octane
Please also tell us what sort of Eee it is. My 1005 sits on standby for a couple of days at least As SD says, hibernate shouldn't sap electrons - when mine's been hiberated with a 100% charge, it wakes up again with 100%. I mean, the machine is off, after all
If you have an old 700 series Eee it is possible that standby will drain it in a day if it's been worked hard.
SO