I am trying to troubleshoot battery life issues in OS X Lion on my MBA13. Is there an app (or hidden system information) that can tell me how long my computer has been on since last full charge. I am not looking for uptime, but looking specifically for Time Since Last Full Charge, just as is available in iOS.
You could try MiniBatteryLogger
It helped me troubleshoot my battery issues. I'm not sure it will do exactly what you asked for but when you have it running (on battery or power adapter):
And right now it's even free:
Everything you need is provided with OS X.
For graphical details and an overview, open Activity Monitor and the energy tab lists the time you have been on your current power source:
In my case, it was showing 5 hours on AC power, so I disconnected the charger to show that the battery is just starting up. The graph on the right will give you a nice history if you go between multiple charge/drain events over the last 12 hours.
For details, use the
Since that log is verbose, you might start with filtering the messages about Using