Long term low power storage.

Good evening.

I have successfully built a working "Simple Bat Detector":

http://home.earthlink.net/~bat-detector/BatDetSch.gif

I was wondering how I could somehow "count" the pulses off the divider and store the data on some form of storage. Ideally I would want maybe a week or so power off maybe a small 12v battery.

Am I right in thinking I could use an Arduino Micro (or similar small board) to use its internal counter and somehow hook up of of those SD card readers on it?

Want a plot of basically time vs count. I know some people had done this before but they took their project down a few years a go and not been able to contact them.

I think an SD card might work well. Know that there are a couple versions and if you want the time stamp you will need to get oen with the RTC (real time clock), or make your own RCT. Also from what I am reading a 6volt battery would be better. If you find it does not run long enough, you can put 2 or 3 in parallel.