On Tue, Nov 22, 2011 at 4:26 PM, Bret Foreman <[email protected]> wrote: > 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.
You can get bigger power sources than that, in the form of external USB power blocks, solar panels, UPSes, marine batteries, etc. This assumes your charging port is free. OTOH, I've never tried using one of those with an off-the-shelf device for weeks at a time. > 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? If your CPU is in sleep mode except during a small window to gather and upload your data (e.g., using AlarmManager) maybe you could get this sort of life, but I'm dubious it can make it 4 months. After all, the battery loses power even if the device is completely *off*. If the CPU is supposed to be on all the time collecting sensor data, fuggedaboutit. -- Mark Murphy (a Commons Guy) http://commonsware.com | http://github.com/commonsguy http://commonsware.com/blog | http://twitter.com/commonsguy _The Busy Coder's Guide to *Advanced* Android Development_ Version 2.1 Available! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
