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I'd guess:

- write a little code to drive this API: http://stackoverflow.com/questions/7785096/read-laptop-batte...

- and either use a task scheduler to run your code every minute, or startup a long-lived process which just does this and sleeps

- output in whatever format you like. CSV is obviously good, but given richer APIs on windows you could dump it straight into an excel sheet I guess.

RRDTool is great for storing these sorts of time-series archives, and it will generate pretty graphs as well. You could cobble together an app starting from these StackOverflow postings:

Task Scheduling: http://stackoverflow.com/a/2725908

RRD interface: https://pypi.python.org/pypi/PyRRD

Battery reading: http://stackoverflow.com/a/6156606

http://www.techrepublic.com/blog/windows-and-office/check-ou...

This one will also output in XML. The APIs should be there in Windows 7, too.

I have no experience with this kind of stuff for Windows, but I really hope somebody wiser than I can do it easily. I assume there must be an equivalent to cron in win8?