Nishkam Ravi
Context-aware Battery Management for Mobile Phones

We present a system for context-aware battery management
that warns the user when it detects that the phone battery
can run out before the next charging opportunity is encountered.
At the heart of this system, are algorithms that predict:
(1) when the next charging opportunity will be available,
(2) how much call-time will be required by the user in the interim, and
(3) how long the battery will last if the current set of applications
continue to execute. We propose algorithms that process user's location
traces and call-logs for making some of these predictions. We also
propose a technique for greatly improving upon existing battery lifetime
prediction algorithms using a new {\it discharge speedup factor} metric
for applications. We present the design of the system and demonstrate its
feasibility by experimentally showing that each of the prediction
algorithms can perform with fairly high accuracy.