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Most 2020-vintage lithium batteries (in North America) are optimized for long cycle life by discharging down to 20% of nameplate capacity, at which point a "Fully Discharged" message is sent by the BMS. If someone re-programs the BMS to harvest all or some of the bottom 20% capacity, that will materially reduce the number of cycles a battery can charge-discharge. Knowing that OEM's have made no maintenance provision to swap out lithium modules at the end of useful life (sorry, just scrap the EV/PHEV after 8 years), folks may want to treat their battery life carefully. Getting more range from a battery module is definitely possible but there are definite trade-offs. Also note that OEM CFO's have made no provision for replacing "worn out" battery packs under warranty, so expect them to fight tooth and nail to prevent owners from ever cashing in on their battery warranties except under super-lemon circumstances.
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