this post was submitted on 28 Nov 2023
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It sounds like you could've taken that car back for a warranty claim.... depending on your state it should be able to do about 30 miles after either 8 or 15 years, and your was doing less than 20 at 9 years... I assume you were in an eight year state?
Having said that, draining the battery fully every day will absolutely kill it. It's not good for the battery to be empty that often... an EV with a 300 mile range and the same driving pattern could probably go well over a million miles on the original battery. That's far longer than the typical life of a modern ICE engine (unless its an engine specifically intended for commercial fleets - those last longer).
Of course, a battery that can do 300 miles is very expensive.
This is the real reason I think high mileage batteries are important... I think most people don't need 300 miles, but a battery that can do that can also be charged to 60% or 80% and charged before going below 20%, which should dramatically improve its life (saving the full capacity for the once in a while longer trips)
Tesla recommends (I think it's the default?) limiting charging to 80% and when they drain as low as 20% they shut down to protect the battery. You'll need to call a tow truck unless there's a major emergency/evacuation, then they take advantage of the car's cellular connection to unlock the last 20% and allow drivers to use the whole battery.
I don't think the Volt did that. Maybe newer (and more expensive...) GM EVs do though.