[NickM]

Tesla itself would disagree as it has stated 70% after 7 years/100k miles.

Citation? I've never heard of Tesla claiming anything close to that.

[pbreit]

From Tesla S-1: "We currently expect that the Tesla Roadster battery pack will retain approximately 60-65% of its ability to hold its initial charge after approximately 100,000 miles or seven years"

Any citations for whatever you've heard.