Configure lowered max charging rate

🚧 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/configure-lowered-max-charging-rate/
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My older Tesla Model S no longer Supercharges at its original rate, topping out at ~120 kW, and rapidly dropping to under 100 kW. There should be an option like battery degradation to adjust this, so that charging times reflect reality more closely.