i got 2600 mAh powerbank for Pi and it manages to stay for some time for my use..But i want to avoid wrong shutdowns due to power failures so ..
Which will be the best way to avoid power failure shutdown ...
if it is not possible, then how android devices manages to do that ?
In the scenario of a USB power pack, you'd have to add a circuit to the Pi that monitored its own voltage, e.g. through an ADC (analogue-to-digital converter). This would give you the capability to estimate when battery was low enough to trigger the internal power pack cut-off. A simple service running in the background would check the voltage every few seconds and could trigger the shut down as necessary.
There's some circuitry out there that already does this. The MoPi board should be shipping soon. It has all of the hardware and software to do the monitoring and shut down from batteries. Something like it is probably the best bet for an easy solution to battery power.
This is not possible due to the fact that the Raspberry Pi does not have the drivers to handle power management in terms of batteries. I am not sure how mobiles do it, but I believe they have a built in chip for the regular battery, but in these USB powered ones I believe it may just be measuring the voltage, correct me if I am wrong.
I hope this is usefull: http://raspi.tv/2013/controlled-shutdown-duration-test-of-pi-model-a-with-2-cell-lipo
Cheers
