The utility of smartphones has been limited to a great extent by their shortbattery life. In this work, we propose a new approach to prolonging smartphonebattery life. We introduce the notions of "valueless" and "valued battery", asbeing the available battery when the user does or does not have access to apower source, respectively. We propose a cooperative system where users withhigh battery level help carry the traffic of users with low battery level. Ourscheme helps increase the amount of valued battery in the network, thus itreduces the chance of users running out of battery early. Our system can berealized in the form of a proximity service (ProSe) which utilizes adevice-to-device (D2D) communication architecture underlaying LTE. We showthrough simulations that our system reduces the probability of cellular usersrunning out of battery before their target usage time (probability of outage).Our simulator source code is made available to the public.
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