I've a Lenovo ideapad Z500 laptop with Windows only energy management software (my battery stop charging at 60% for long lasting life). Setting the threshold from Windows, it remains also with Ubuntu 13.10 64 bit, and that's ok.
In my case, battery is discharged in a strange way: it takes 30 minutes for consuming it from 60% to 40%, and then it suddenly drops to 5% in one second.
This behaviour is the same with various tools: laptop mode tools, TLP, powertop.
I'm using Bumblebee for dual gpu management (intel + nvidia), Gpu temperature is < 50° in normal situation. What can I do for obtaining a longer battery duration? I explored some options but no results.. - Thanks and sorry for my poor English