How do you check a used EV's battery health? / Used Tesla or premium EV buyer who wants a verified SoH number before paying a lot

Used Tesla or premium EV buyer who wants a verified SoH number before paying a lot

What people actually reported
Dealer report showed 89% SOH vs expected 92-93%
“A 3 year old C40 with about 8k miles came back at 89% SOH when I was expecting 92-93%.”
@ehartley_
Independent Aviloo test showed 98% at 103k miles
“I bought a 2021 Mach-E with about 103k miles, and the dealer (Recharged) ran an independent Aviloo test on it before I paid. It came back at 98%, which I never would have guessed at that mileage.”
@tcoggins
Dealer confirmed pack and wheels but gave no health figure
“The dealer sent me a photo of Settings > About, which confirmed the pack and wheels but gave me no health figure. The inspection report only covered brakes, tires and general notes.”
@tom_brannock
Neither dealer mentioned battery health on test drives
“I test drove two 2021 Model 3 RWDs with about 40K miles and neither dealer said anything about battery health, so I didn't think to do the 100% charge and compare to the EPA number.”
@dkaplan_08
Friend's used Model Y tested at 93% after purchase
“A friend's used Model Y tested at 93% when we ran a proper battery health test after he bought it, so a real figure is worth getting in writing before you pay.”
@dennis_marek
Only 3 of 12 cheapest listings showed 85%+ battery health
“The EV lot near me lists battery health on every car and only 3 of the 12 cheapest were at 85% or better, which surprised me.”
@jason_holguin
Bought a used Tesla with no battery proof; regrets it
“I looked at several small dealers around Chicago for a used Tesla and not one listing showed a number. I bought anyway and it's been a nightmare since.”
@tkowalczyk_
Questions still raised in the forum