The motors, of course, are accessible on the wheels. The controllers are easy being in the frunk. But what about the batteries? If you want to remove, replace, or repair the batteries do they come out under the vehicle or do you remove the interior/floor and take them out through an open door?
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Since degradation is SO slow per mile, it seems like our batteries may die of old age first, since something like 10 years seems to be what most people claim. In that case, years might still be the right metric.
On the other hand, if you believe the Samsung SDI claim of "30 years +", that's what's in my Fiat 500e 🤞 Here are some anecdotal examples for it:
My own current EV's 24kWh battery has only 26,000 miles but also has no sign at all of battery degradation.
Other 500e users report the same, even with twice that mileage.
2 other users with similar mileage have measured their capacity loss* at about 2.3% every 10,000 miles. This still gives little to no sign even after 50,000 miles because it makes as little difference as a few mph of headwind.
*by performing the EPA procedure of discharging until the motor stops & then fully recharging on a metered charger. Then they compare the meter reading to the EPA spec.