P3 perform calculations to select a battery, based on performance and construction, for a given motor vehicle application P3 for Unit 48 c) This task requires you to consider the performance and construction of a battery for any one of the vehicles you work on at MoD Lyneham. First- Performance: Describe the impact of cold cranking, other draws on the power of the battery (for example the demand from modern computer and security systems when the vehicle is idle) and issues such as amp/hour rating. Construction: Describe the battery's casing, plates and separators. You will also need to include how connections are achieved and electrolyte is used. Then, for one vehicle you work on at DSEME, perform the required battery calculations and state the required battery specification for the vehicle. Tip: Draw from suitable references (for example manufacturer's recommendations, types, makes and performance capabilities) when specifying the battery and use your calculations to determine battery capabilities.