The objective of the Consumers, Vehicles and Energy Integration project is to inform UK Government and European policy and to help shape energy and automotive industry products, propositions and investment strategies. Additionally, it aims to develop an integrated set of analytical tools that models future market scenarios in order to test the impact of future policy, industry and societal choices.The project is made up of two stages:Stage 1 aims to characterize market and policy frameworks, business propositions, and the integrated vehicle and energy infrastructure system and technologies best suited to enabling a cost-effective UK energy system for low-carbon vehicles, using the amalgamated analytical toolset. Stage 2 aims to fill knowledge gaps and validate assumptions from Stage 1 through scientifically robust research, including real world trials with private vehicle consumers and case studies with business fleets. A mainstream consumer uptake trial will be carried out to measure attitudes to PiVs after direct experience of them, and consumer charging trials will measure mainstream consumer PiV charging behaviours and responses to managed charging optionsThis report represents Deliverable D3.1, Battery Cost and Performance and Battery Management System Capability Report and Battery Database.The purpose of this report is capture the approach proposed to develop cost and performance projections for automotive batteries to 2050. A brief explanation of the battery components and working principles is provided before the overall data collection and modelling methodology are described. This is followed by a presentation of the cost and energy density projections for automotive battery packs. Several scenarios have been developed for use in the wider modelling framework of the CVEI project.The report also includes an assessment of Battery Management Systems (BMS), their current features and potential additional capabilities required to provide tighter integration of electric vehicles (EVs) into the electricity system.The separate spreadsheet(accompanying this report) provides more detail in the form of the Battery Cost and Performance Database.