Hi Tony, I found this with Google and "9V battery discharge curve". I
presume you're asking about the PP3 size (nominally in this case a
stated 580mAh)

This link is supposed to be underscored right across btw. They show
lifetimes into 180R (50mA) and 990R (9.1mA) with a cut-off of 5.4V
You may be able to extrapolate from this if no one has an actual graph.
Don't forget that increasing internal resistance will play a part towards
the end of the battery life. I have no idea of the quality of "3 Turn"
cells,
I expect there's some wide variation between retail and OEM types
across the various manufacturers

http://www.dongyang.net.cn/cn/enterprise/3turn/english/cpjs(English)-many3.h
tm

And here's what may be a handy discharge curve for 12V batteries

http://www.gaston-batteries.co.uk/GTTech/Discharge/DischrA.html

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