Show battery temperature in the charging graphs in Routes

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/show-battery-temperature-in-the-charging-graphs-in-routes/
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When looking back at trips in Routes, you can see a graph for a charging session. However in that graph the temperature shown is the outside temperature. Not the battery temperature. The battery temperature would be more logical to show since that explains unexpected drops in charging speed