EV batteries may last up to 40% longer than expected – Stanford
Real-world driving and charging habits may make EV batteries last longer than researchers previously thought, finds a new Stanford-SLAC study.
A new study from the SLAC-Stanford Battery Center published on December 9 in Nature Energy suggests that real-world driving habits – like stop-and-go traffic, highway driving, quick city trips, and lots of time spent parked – could make EV batteries last about a third longer than previously thought. This means the average EV owner might not need to replace their battery pack or upgrade to a new car for several extra years, saving money and extending the life of their ride.
Battery scientists usually test new designs in labs by cycling them at a constant rate of discharge and recharge, speeding up the process to quickly see how long they’ll last and how well they perform. However, according to a new study published on December 9 in Nature Energy, that method doesn’t reflect how EV batteries are used in the real world.
For everyday EV commuters, this is big news. While battery prices have dropped by about 90% in the last 15 years, they still make up nearly a third of the cost of a new EV. The study suggests that current and future EV drivers could enjoy more miles before needing a replacement.
“We’ve not been testing EV batteries the right way,” said Simona Onori, senior author and an associate professor of energy science and engineering at the Stanford Doerr School of Sustainability. “To our surprise, real driving with frequent acceleration, braking that charges the batteries a bit, stopping to pop into a store, and letting the batteries rest for hours at a time helps batteries last longer than we had thought based on industry-standard lab tests.”
The researchers created four different EV discharge profiles, ranging from the usual constant discharge to more dynamic ones based on real-world driving data. Over two years, they tested 92 commercial lithium-ion batteries using these profiles. The results were clear: The closer the profiles matched actual driving behavior, the longer the batteries lasted.
So, what’s behind this surprising longevity? A machine learning algorithm trained on the mountain of collected data helped uncover how dynamic discharge patterns reduce battery degradation. Turns out, the way people actually drive might be easier on batteries than scientists expected.
For example, short, sharp accelerations in EVs actually slow down battery degradation. That flips the script on what researchers – including this study’s own team – had assumed for years: that acceleration spikes were a battery’s worst enemy.
Alexis Geslin, one of three lead authors of the study and a PhD student in materials science and engineering and in computer science in Stanford’s School of Engineering, explained:
We battery engineers have assumed that cycle aging is much more important than time-induced aging. That’s mostly true for commercial EVs like buses and delivery vans that are almost always either in use or being recharged.
For consumers using their EVs to get to work, pick up their kids, go to the grocery store, but mostly not using them or even charging them, time becomes the predominant cause of aging over cycling.
The study pinpointed a sweet spot for discharge rates that balances time aging and cycle aging – at least for the commercial battery they tested. That range aligns with how most people actually drive their EVs. Automakers could use this insight to tweak battery management software, helping to extend battery life and optimize performance for real-world driving.
Going forward, energy science and engineering postdoctoral scholar Le Xu notes, “Researchers can now revisit presumed aging mechanisms at the chemistry, materials, and cell levels to deepen their understanding. This will facilitate the development of advanced control algorithms that optimize the use of existing commercial battery architectures.”
Read more: Researchers develop EV battery that charges 0-80% in 15 minutes
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The BYD “Shenzhen” set sail on its first voyage overseas this week. With 9,200 parking spots, or about enough to fill 20 football fields, BYD’s new car transport ship is now the world’s largest.
BYD’s largest car carrier sets sail for Brazil
BYD’s Shenzhen is on its maiden voyage to Brazil after setting sail on April 27. The vessel is carrying over 7,000 new energy vehicles (NEVs), including electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs). It’s the largest single batch of NEVs exported from China so far.
The new vessel is BYD’s fourth car transport ship and the world’s largest, capable of carrying 9,000 vehicles. According to the company, that’s enough to fill about 20 football fields.
BYD launched its first car carrier, the Explorer No 1, in January 2024. It has already completed several trips to Germany, Spain, and Brazil.
Its second, the BYD Changzhou, set sail in December 2024, followed by the Hefei earlier this year. All three vessels can carry up to 7,000 vehicles, making the Shenzhen the largest so far.
The Shenzhen is named after the automaker’s hometown and demonstrates “BYD’s firm determination to promote sustainable development in Brazil.”
BYD is preparing to launch two more vessels, the Changsha and Xi’an. The Changsha is expected to launch soon, while the Xi’an was introduced on April 2.
The new car carriers will help accelerate BYD’s aggressive overseas expansion. In the first three months of 2025, the company sold over 206,000 NEVs overseas, more than double the number it sold last year.
BYD sells a wide range of vehicles in Brazil, including the low-cost Dolphin Mini, starting at around $20,000 (99,800 BRL). In October, it launched its first hybrid pickup truck, the Shark, starting at 379,800 BTL ($66,900).
Brazil is only one overseas market that BYD is targeting. BYD’s sales are expected to double in Europe in 2025, with significant growth in other key regions like Southeast Asia, Japan, Mexico, and South Korea, to name a few.
Source: BYD
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‘Tesla homes’ in a Houston neighborhood where all the homes have Tesla solar roofs and Powerwalls went for sale.
7 out of the 11 homes have reportedly already sold.
Tesla neighborhood is a term that is being used for new developments where all the homes integrate all or part of Tesla’s power ecosystem, including the Powerwall home battery pack.
The best example is a giant new development project in Austin, Texas, by Brookfield Asset Management and Dacra in which up to 12,000 new homes are to be built and offering Tesla solar roofs and Powerwalls.
However, since the announcement, it looks like only some of the homes in the new neighborhood have Tesla energy systems.
In 2022, Tesla also announced a similar project in Las Vegas.
A year later, the company claimed to have deployed “over 600 solar neighborhoods” worldwide, with a total capacity exceeding 100 MW.
One such ‘Tesla neighborhood’ is a small block of 11 townhouse homes featuring Tesla solar roofs and Powerwalls in Houston, Texas.
The homes were recently completed and went on sale, starting at $544,900.
Here are some pictures from the listings:
Utopia Homes, the developer behind the project, described the properties (via Chron):
Step into modern elegance expertly crafted by Utopia Homes. This property showcases groundbreaking Tesla Solar Roof Shingles and Power Wall technology, ensuring 100% energy security and eliminating electric bills for a truly sustainable lifestyle.
The house has proved popular according to the real estate agents, with 7 out of 11 homes already sold.
As we recently reported, Tesla’s solar roofs have proven to be a more expensive and niche product than the company previously presented.
Tesla has largely stopped discussing it, but it is still being deployed through some third-party installers, such as in this case, on new homes.
However, its Powerwall product remains a very popular solution for homeowners seeking greater energy independence and protection against outages, which have been a frequent problem in Texas.
More homeowners are turning to generators, and alternatives like home battery packs are gaining popularity.
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Canadian electric propulsion specialist Vision Marine continues to graduate beyond advanced outboard motors into a provider of all-electric boats. This month, Vision introduced two new electric pontoon boats – the 12-passenger V24 and 15-passenger V30, each capable of a range up to 90 nautical miles.
Vision Marine Technologies ($VMAR) is a Canadian technology company with over 25 years of experience in the marine industry. The company made waves (literally) by introducing its E-Motion turnkey powertrain system, which it has since integrated into a catamaran speedboat, which set a speed record of 109 mph in 2022.
Since then, Vision has introduced six hp two-cruiser vessels – the Fantail 217 and Volt 180, each capable of transporting 10 passengers via its E-Motion technology. Most recently, Vision Marine has integrated the full power of its 180 hp electric powertrain technology into two additional vessels, both electric pontoon boats.
Earlier this month, the company officially began sales of the Vision V24 and V30, which you can view below.
Vision Marine brings power and range to electric pontoons
According to Vision Marine Technologies, orders for its two new electric pontoon boats are now open, and they are touting the same E-Motion technology that put the company on the map a few years ago.
The first model is the V24, a 12-passenger electric pontoon that is 24′ 8″ in length and has 180 hp. The ultra-quiet E-Motion powertrain is powered by a standard 43 kWh marine battery pack, offering 40 nautical miles (46 miles) of all-electric range on a single charge. For added range, Vision sells a version of the electric pontoon with a second battery pack, totaling 86 kWh and delivering up to 90 nautical miles (104 miles) of range.
While the V24 offers more of a classic attempt at the pontoon boat, Vision’s additional new vessel, the all-electric V30, is a tad sportier and provides room for more passengers aboard (15). This 30′ vessel features the same E-Motion powertrain options, complete with the same two battery configurations to offer the same ranges as the V24.
However, the V30 has additional features such as 4 x 6.5″ interior speakers and cool-touch seats. Both models feature an integrated onboard charger that supports both 120- 240V (30 to 50 amps) for seamless charging, no matter the dock plug while moored.
The Vision V24 starts at $99,995 for the standard battery pack version, while the V30 starts at a higher price of $139,995. As previously mentioned, both electric pontoon boats are available to order today.
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