Hi I usually make Arduino protos without worrying about power- there will always be power so why worry. Recently I was asked to make simple device that counts clicks/ticks and logs its somewhere. Easy enough-but the problem is it needs to run concealed inside a device for 3-5 years of a battery. I came across this http://interface.khm.de/index.php/lab/experiments/sleep_watchdog_battery/ and the theory is that it can run up to 3 years. Its fantastic because it is nearly what I want. Has anybody every actually run a device like this for 3-5 years of a battery? In research i came to the conclusion that using Lithium Polymer would be the best battery for long term power- am I correct? and using a single 700mAh LiPo could technically last to 5 years. Is this lifetime of a battery even feasible?
Now I will try and change that project to wake the Arduino every time i get an external tick/click and it will increment.
The second part is- Is it possible to store simple small integers inside the Arduino non-volatile memoery somehow to avoid keeping it in RAM and using power?
I appreciate any suggestions.