if I were to buy one battery pack for the camera, how long do you think it will last? Thanks.
It will depend highly on how much you use it and how long you recharge it. Too hard to tell exactly how long that would be.
For what specific camera? Different cameras draw different amounts of power. It also depends a lont on how you use it.
as in how long in years and recharges or how long as in how many pictures can you get out of it? In years-they can last a mighty long time. I still have the original battery that came with each one of my DSLR's. I have a rebel that I got in 2003 and the original battery still works fine in it.