It's the question underneath every other question on our floor: how long until the battery is toast? The fear is a phone battery scaled up to car prices. The reality is a curve that behaves nothing like your phone's.
The curve: a dip, then a very long plateau
Packs typically lose a few percent of capacity in the first year or two as the chemistry settles, then flatten into a slow taper of roughly one percent a year. Fleet data across hundreds of thousands of EVs keeps confirming the same shape — cars crossing 200,000 miles with 85%+ of their original range are ordinary now, not outliers.
Sudden failure is rare, warrantied, and usually a single module rather than the whole pack. Gradual fade is the real story, and it's slow enough that most owners never notice a specific day it happened.
What the warranty floor means
Federal rules require every EV's pack be covered for at least 8 years or 100,000 miles, and manufacturers add a capacity floor — commonly 70% — under which they repair or replace. That warranty follows the car, not the owner, which quietly makes used EVs some of the best-protected purchases on the market.
Habits that help (and the one that hurts)
Three easy ones: set the daily charge limit around 80% and save 100% for trips, avoid parking for weeks at a full or empty pack, and don't make DC fast charging your everyday routine. Heat is the real enemy of lithium chemistry — one more advantage of the temperate Northwest.
None of this requires vigilance. Set the charge limit once in the car's menu and the pack quietly takes care of itself.
Written by the Diplomat Motors team — the specialists on our Troutdale and SE Portland floors. Questions about anything here? Talk to a human.
