In this work, an analysis is made of energy expenditure in outdoor sporting environments. Battery efficiency is becoming an increasingly relevant topic in the context of the most varied outdoor end-user services, among other realms. This is a key to acceptance and use of technology. In outdoor environments, battery efficiency can be low, especially when information based on close-to-real-time requires Internet access, and use of sensors. Such requirement is today evident with the growth of Internet dependence and multiple sensors, which performed both actively and passively via fitness gadgets, smartphones, mobile pervasive systems, and other personal mobile gadgets. In this context, it is relevant to understand how energy is spent from the accelerometer, global position system, and Internet access (Wifi \& Mobile Data), to best providing smart data to sports activities. This paper makes an analysis based on battery gains and reduction of energy expenditure and presents a new mathematical model taking into account the restrictions imposed by outdoor environments.

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• Electrical Engineering, Electronic Engineering, Information Engineering - Engineering and Technology