(Program Request) Time Since Last Charge

I've done a little looking on this and can't find much more than a today plugin (iPAQpanel)... which is pretty useless because I still use and enjoy TF3D. I've been using no2chem's nuePower and CPL addin, so naturally I sent a request for him to add that to the control panel, if he's still working on it.

I'm otherwise looking for a program to monitor this for me, I don't care if I have to run it separately, or if it's somewhat inconvenient... I just forget to make note of the time I pull it from the charger in the morning, or will forget it in the middle of the day. I keep wanting to see how the changes I make effect battery life.

Anyone know of anything that will take care of this?