I am working on a design that needs to operate outside on two AA batteries for at least a year.

I have optimized the design to reduce power and using a spreadsheet analysis I now have an average current consumption. I should be able to verify that is right by monitoring a prototype for a while.

I have the following pieces of information:

* Average current consumption in mA \$Cave\$
* Supply of Duracell AA batteries in mAh \$Bsupply\$
* Starting battery voltage \$Bmax\$
* Minimum battery voltage for DC-DC converter \$Bmin\$
* Non-linear discharge profile from Duracell website https://d2ei442zrkqy2u.cloudfront.net/wp-content/uploads/2016/03/MN1500_US_CT1.pdf
* Climate data

How can I take this to create a realistic estimate?

I think it is perhaps reasonable to use the average environmental temperature \$Tave\$.

Note - I chose Duracell simply as an exemplar of a quality battery. I wouldn't need/want to consider poorer-quality batteries.

Many thanks!

Update - average power consumption is 1.11mW.