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A computer controlled, two-stroke engine with integral generator could provide either emergency charging or range extension for EVs:


As my ultimately un replaceable Tesla battery ages, it becomes more attractive to have a lightweight trailer with a 25 kW, flex-fuel, generator. Of course this assumes available and affordable fuel.

Bob Wilson

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NPR: How long do electric vehicle batteries actually last?

... As the fleet of EVs on the road ages, new data pooled from tens of thousands of vehicles is showing those batteries are lasting longer than expected. ...

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At auto auctions, a lot of healthy batteries
... "We were expecting battery health to be experiencing mass degradation over the first one to three years of owning a vehicle," George says. "What we have seen, though, is that these 2, 3, 4-year-old off-lease cars that are coming back have battery health scores well upwards of 95%."

Recurrent's data also shows that cars from most major brands retain 95% or more of their expected range after 3 years, thanks in part to software and...