[android-developers] Extreme battery life

I'm looking to put a phone in a remote location off the grid to report
back some sensor data once a day. I can buy after-market extended-life
batteries for many popular phones and I'm wondering what kind of life
I might get from this arrangement. The big batteries hold about
4000mAh. I'd like the whole rig to run for 4 months - about 2400
hours. That implies getting the average phone draw well below 2mA.

If my app keeps the phone in airplane mode except once a day to fire
up and send data, and if the rest of the wireless networking is turned
off, and if the screen is never on, does this sound feasible?

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