The contribution to this industry report was made as part of a seminar, where Thomas Jalili Tanha presented his findings from a carbon impact analysis about 2nd-life energy storage. Thomas Jalili Tanha received funding for his PhD from the ESRC as part of his studentship. Frazer Wagg co-authored this contribution and supported Thomas Jalili Tanha as an industry partner in the construction of the carbon impact analysis. The modelling and documentation for the presented output is available at: https://github.com/TJaliliTanha/Carbon-Impact-Analysis-Two-lives-EV-BESS