Allow negative battery level at destination

🚧 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/allow-negative-battery-level-at-destination/
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This will allow me to do a quick trip plan to see how much battery I need, but manually add charge stops later. Google’s system in Polestars does this.