Legacy ESS Main Battery Pack Advice
In conversations with JB Straubel, the CTO of Tesla for over a decade, and heavily involved in the Roadster battery pack design, he admits the pack was designed for a 10 year service life. We are all pleased and surprised many Roadsters with original battery packs are still going strong after 14 years.
However, since the cells are marginalized by age, we do not recommend doing any more range charging, or depleting state of charge below 30 miles range. Keeping the yellow charge cable plugged into the Roadster when parked is the safest way to preserve the pack until replacement to the Tesla 3.0 pack