The key point here though is that for the past several years (2,3, 4 years or more) EVERY SINGLE TIME i measure 3.6v then about 10 pictures later i have to recharge my camera battery.
Yes, for certain applications, like a flashlight or a camera, each particular application will show similar battery voltage discharge curves, over a limited number of discharge cycles.
It is absolutely guaranteed that the discharge curve for examples like the above will not be applicable to an arbitrary application or an arbitrary discharge profile, for any type of battery.