Batteries are replaced less often than engines.
The vast majority of charging will occur at night when there is less stress on the grid. The strain on the grid comes not in the amount used, but when it is used. That said, there will be additional strain and investment does need to be made.
Someone posted a cool link few months ago to how the grid will need to expand but will be able to keep up and how we already faced another time where we had to ramp up similarly in the 60s through 70s for another big event: the widespread use of central air conditioning
That’s why the metric is based per miles, not absolute number.
Wut?
www.howtogeek.com
The technology will keep improving just as it has with combustion engines.Wut?
How Much Does an Electric Car Battery Replacement Cost?
Modern electric vehicles (EVs) will last quite a while on their stock battery pack, but eventually they’ll degrade and need to be replaced. The prospect of a replacement might make you hesitant about buying an EV, so what will a replacement actually run you, and how can you avoid needing one?
Some EV batteries cost as little as $2,500 to replace, while others can be upwards of $20,000, according to an analysis by Recurrent Auto. Even at the low end, that’s still about as much as replacing a gasoline vehicle’s transmission. The good news is, we’ll probably see those costs decline in the next few years.
Electric car batteries are already cheaper to replace than they were when EVs first got popular. According to the Bloomberg report, the average cost of a new EV battery pack in 2010 was over $1,000/kwh. With advances in battery technology, we could see prices around $100/kWh by 2023, with further decreases as technology improves.
