I found out why my tablet's battery sometimes drains. I don't know if others are similarly affected, but I'll explain in case it might help and to see if someone can offer a solution. I have my n810's wireless to "always ask". At home, I leave it permanently connected without problem - the power management of the tablet is fantastic really. HOWEVER, if I leave my house and the wireless disconnects after signal loss, the tablet is left in a state with wireless activated *AND* power management set to OFF (I can check with iwconfig). Of course, this causes a large batter drain. This is not proper behavior. If you manually disconnect the wireless goes to an off state called "not ready" in iwconfig. I have to reboot to reset the wireless to proper state and then the battery no longer drains. Does anyone know a fix for this?