On Nov 22, 1:44 pm, Mark Murphy <[email protected]> wrote: > 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. > No, I don't have to take sensor data except right before I launch the daily reading. But even when the CPU is just ticking over doing nothing it still has to keep a bunch of volatile state in registers and RAM and such. All that stuff might add up to over 1 mA. Really deep sleep modes usually store everything volatile into flash and then current drops to under 10 uA - just enough to run a little wake-up counter. But I don't think Android can do anything like that, even if the underlying hardware (like the ATMega) supports it.
Solar is not an option but outboard batteries might work. Charging through the USB port is not very efficient, though, so I'd lose a lot of the benefit of a big external battery. -- 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
