Back in 2015 I bought a wrecked 2013 Nissan leaf and salvaged it’s 48 battery modules to use in my s-10 electric pickup truck. At the time, the batteries had 18,921 miles from the Leaf on them, (10 quick charges and 775 Level 1/ Level 2 charges) and the leaf BMS reported a capacity of 64 amp hours (98% state of health). [The modules are rated at a minimum of 60 AH new, but most exceed the minimum specifications a bit.]
After I re-configured them into eight 16 volt packs so that I could use them in my truck’s 120-130 volt system, they drove my s-10 pickup truck from 2016 through the beginning of 2021, when I sold the truck but kept the batteries (the buyer already had some Chevy Volt batteries he was going to use). In those five years I put 16,836 more miles on the batteries in the S-10 truck, and used about 7.3 mega watts of power to re-charge the truck, or an average or 430 watts per mile from the wall, including charging losses.
After this usage and and at 8-9 years of age, I tested some of the modules, and found that their current capacity is in the 47-48 AH range. This is 80% of their rated new capacity, or 75% of their actual new capacity (or 18 kWh capacity for 48 modules, compared to the 24 kWh rated capacity of a new 2013 Nissan Leaf pack).