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DC fast charging not as damaging to EV batteries as expected

As convenient as DC fast charging is, there have been lots of warnings that repeated dumping of so many electrons into an electric vehicle's battery pack in such a short time would reduce the battery's life. While everyone agrees that DC fast charging does have some effect on battery life, it may not be as bad as previously expected. Over on SimanaitisSays, Dennis Simanaitis, writes about a recent presentation by Matt Shirk of the Idaho National Laboratory (INL) called DC Fast, Wireless, And Conductive Charging Evaluation Projects (PDF) that describes an ongoing test of four 2012 Nissan Leaf EVs that are being charged in two pairs of two. One pair only recharges from 50-kW DC fast chargers, which the other two sip from 3.3-kW Level 2 chargers exclusively. Otherwise, the cars are operated pretty much the same: climate is automatically set to 72 degrees, are driven on public roads around Phoenix, AZ and have the same set of dedicated drivers is rotated through the four cars. "Degradation depends more on the miles traveled than on the nature of recharging." What's most interesting are the charts on page seven of Shirk's presentation (click the image above to enlarge), which show the energy capacity of each of the four vehicles. When they were new, the four batteries were each tested to measure their energy capacity and given a 0 capacity loss baseline. They were then tested at 10,000, 20,000, 30,000 and 40,000 miles, and at each point, the DC-only EVs had roughly the same amount of battery loss as the Level 2 test subjects. The DC cars did lose a bit more at each test, but only around a 25-percent overall loss after 40k, compared to 23 percent for the Level 2 cars. Simanaitis' takeaway is that, "INL data suggest that the amount of degradation depends more on the miles traveled than on the nature of recharging." The tests are part of the INLs' Advanced Vehicle Testing Activity work and a final report is forthcoming. These initial numbers from IPL do mesh with other research into DC fast charging, though. Mitsubishi said daily fast charging wouldn't really hurt the battery in the i-MiEV and MIT tests of a Fisker Karma battery showed just 10-percent loss over 1,500 rapid charge-discharge cycles.

Nissan Leaf Nismo RC Concept [w/video]

Nissan took the wraps off its Leaf Nismo RC Concept at the New York Auto Show more than two years ago. As inferred, the vehicle shares many of its pure-EV components with the production Leaf currently sitting in your dealer's showroom. But don't assume the concept is a placid, family friendly, four-place, front-wheel-drive plug-in for grabbing groceries - the RC (as in "Racing Challenge") is a purpose-built, two-seat, rear-wheel-drive prototype race car tuned for the short track.
The RC Concept is fitted with an 80-kW AC synchronous motor driving the rear wheels and drawing power from a 48-module lithium-ion battery. While the motor and battery are nearly identical to the consumer-friendly Leaf, a sleek full carbon-fiber monocoque body shell and a slew of other enhancements mean the RC is 40-percent lighter, a foot shorter in overall height and nearly seven inches wider than its commuter namesake. Nissan says the RC Concept will hit 62 miles per hour in about 6.8 seconds, top out at 93 mph and run for about 20 minutes under race conditions (it will accept an 80-percent charge in 30 minutes with a quick-charger). Understandably, if a zero-emissions motorsport series comes to fruition, the races would be short and nearly silent.
We caught up with the Leaf Nismo RC concept in Southern California, where we were offered the opportunity to zip it around a tight autocross at the former Marine Corps Air Station, El Toro.

Nissan prices replacement Leaf battery at $5,500

The battery pack is the single most expensive component in a plug-in vehicle and, until now, figuring out the cost to replace one has been a bit of a mystery. Last year, Nissan tried a $100/month price for a new battery in its popular Leaf, but was loudly criticized for that attempt. Today, Nissan is changing gears with a big announcement regarding the price of a new pack for your Nissan Leaf: $5,500 to buy. With an asterisk. Nissan's Brian Brockman, writing at My Nissan Leaf, announced that Nissan Leaf replacement batteries are now available to purchase at certified Leaf dealers in the US at a suggested retail price of $5,499. These packs are the ones found in 2015 Leaf models, which are similar to the ones the Leaf has always had, just with a different, better battery chemistry. To buy a new pack, you need to give Nissan your original battery pack (which Nissan says will be recycled and has a value of $1,000) and the $5,500 "does not include tax, installation fees or an installation kit required for 2011 and 2012 vehicles." That kit costs around $225. A $100/month financing program will still be available (details will be made available later) but now it will have an end date and the driver will own the pack at the end of the payment process. All replacement packs will have the same eight-year, 100,000-mile warranty as the battery in a new Leaf. You can read Brockman's full statement below or over on My Nissan Leaf. Ever since the Leaf entered the market in late 2010, Nissan has been dealing with degrading battery issue, both as a real thing (in warm climates like Arizona) and as a worry in the mind of potential customers. Now that we know how much it'll cost to get a new pack, we can calculate that the overall cost for a new 24-kWh pack is now officially $6,500. That means the price to a customer is less than $270-per-kWh. That's quite low compared to some early estimates, right on target with others and a very big deal for EV shoppers and drivers out there. Hi all: I'm happy to be back to provide a long-awaited update on the Nissan LEAF battery replacement plan. Last year, I posted preliminary details of the program that we'd created based on early survey data, and it led to spirited discussion (and very vocal criticism). So we went back to the drawing board with your comments and the ongoing guidance of the LEAF Advisory Board.