I charge every night before I go to bed and leave my N810 on 24/7. I've only had one instance of mysterious low battery. I turn off my WiFi router wwhen I power down my system for the evening. With it off I occasionaly heard the the lost network connection sound. One morning the battery was very low. I now disaable networking as part of my bedtime ritual and the low battery in the morning event has never occurred again. My N8110 is my constant companion aaand assistant. I use it frequently for short periods as well as some longer use periods. The battery time estimate seeems to be based on battery consumption rate aat that time. After finishing a along period of use it may say 3 hrs but after a minute of idel it may say 5 or 6 hrs. For my useage patterns I consider battery life good. I don't have swap enabled aand the only timed event I'm aware of adding is a daily alarm to wake me in the morning.