This is going to sound like a school project, but it's not. Admittingly, I don't have a lot of experience with battery specs and understanding exactly how to predict the life of one. Let me fill you in on some of the details of what I'm after....

I have a lithium Ion (cell-phone) battery that has 3 cells of whom I don't know the manufacturer. I DO know that the pack provides 890mAH at a nominal 11.1 volts. I also know that my circuit, when loaded utilizes 30mA of current.

1) How does one determine the amount of time that will be required at this 30mA load for the battery to be at a specific voltage (say 8.0 volts)?

So I guess at 890mAh and a load of 30mA, the capacity would be a ZERO after 29.66 hours. How can I determine the capacity at 8 volts?

2) I'm also wondering if there is a good way to determine temperature affects on all of this. Does temperature have sort of a linear affect on all of this that I could add into my calculations?

If there is a good resource out there that covers this sort of stuff, I would really appreciate any information or links!

Thanks in advance,
Phil