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Tesla can solve an annoying part of its cars’ ownership experience with Maxwell’s supercapacitors

Tesla Gigafactory Nevada battery cell production line (Credit: Super Factories)

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5 years ago

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When Tesla acquired Maxwell technologies, the electric vehicle community was appropriately excited. Maxwell, after all, works on projects such as dry battery electrode tech and supercapacitors, both of which are believed to hold a lot of potential in the emerging electric vehicle sector. But as the countdown to the highly-anticipated Battery Day draws near, speculations suggest that Tesla acquired Maxwell mainly due to the company’s dry battery electrode tech, not its supercapacitors. Yet according to Andrey Shigaev, CEO of Geyser Batteries, supercapacitors still hold some potential uses for Tesla’s electric cars.

In a brief interview with Teslarati, Shigaev, whose company is developing batteries that use aqueous (water-based) electrolytes, noted that while supercapacitors will likely not be involved in Tesla’s million-mile battery project, there are already a lot of local tasks in an electric vehicle that could benefit from the use of supercapacitors. Among these is smart air suspension, a feature that is currently used in the Model S and X and is expected for upcoming vehicles like the Cybertruck. But beyond this, the Geyser Batteries CEO mentioned that supercapacitors could also be utilized as a superior alternative to the 12V battery that Tesla uses for its vehicles today. 

“The more stuff gets electrified, the more power you need to perform tasks. The most classical thing (that could benefit from supercapacitors) and the number one item for Tesla is the 12V battery. Supercapacitors can handle this task. If you have a high energy battery onboard, then this secondary circuit could be powered by a supercapacitor that is very efficient. It will even have an extremely long life cycle. Supercapacitors are lighter too, saving weight. And they tend to be smaller than a lead-acid battery,” Shigaev said.

Interestingly enough, the earliest versions of the original Tesla Roadster didn’t use a 12V battery. Instead, the company used a portion of the Roadster’s main lithium-ion battery pack to supply 12V for the vehicles’ accessories and lights. This did not prove ideal, however, and in 2010, Tesla switched to using a 12V battery for the Roadster 2.0. It should be noted that the 12V battery, which has been adopted in every vehicle since the Roadster 2.0, is used to keep systems such as emergency blinkers, airbags, seatbelt pre-tensioners, the MCU, and other functions operational even when a car’s main battery pack is compromised. 

Being one of the few parts of the car that is still based on conventional automotive tech, the 12V battery in a Tesla tends to last only a few years. As noted by Tesla Tap, the 12V battery in a brand new Tesla could last about 3-4 years, but this could be reduced to as little as 1-2 years if the vehicle is driven frequently. This could cause annoyances among Tesla owners, especially since the 12V battery’s health could not be actively observed in the vehicle’s systems yet. Social media posts about 12V batteries in Teslas giving out are numerous, with some owners noting that it is the one aspect of the Tesla ownership experience that is still mildly infuriating. 

With this in mind, the use of supercapacitors in place of the 12V battery could be pretty in-character for Tesla. Nevertheless, the Geyser CEO explained that using supercapacitors in place of the 12V battery would present some challenges as well. Among these is cost, since supercapacitors are notably more expensive than standard 12V lead-acid batteries. Yet despite this, the advantages they bring could justify their use, especially among flagship vehicles like the next-generation Roadster and the Plaid Model S and Model X. 

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Next-gen Tesla Roadster and Cybertruck at Hawthorne Design Center, 2019 Tesla Holiday Party (Credit: giftedkick_/Instagram)

“Supercapacitors have a main caveat. There are three drawbacks. First and foremost is energy density, which is ten times lower than lead-acid battery. Second is their price since currently, their price is astronomically larger. The third is discharge. If you leave it alone for almost one month, it would discharge completely. However, if you have an electric car and there’s a high energy battery in the car like a lithium-ion battery, that would be the power source for the vehicle,” Shigaev noted.

Other industry experts have suggested uses for Maxwell’s supercapacitors in Tesla’s electric cars in the past. Auto veteran and Munro & Associates Sr. Associate Mark Ellis previously noted that apart from dry electrode tech, Tesla could tap into Maxwell’s supercapacitors to improve its vehicles’ battery management systems. 

“One of the issues with the battery is, when I step on the throttle hard, I’m pulling a lot of energy from the battery. And then, when I brake hard, I’m pulling a lot of energy out of the regen, but the batteries can’t take it fast enough. The batteries get really stressed when you try to pull it up too much, so if I had supercapacitors that I could use as a cushion; so when I need energy quickly, (I can) pull it from the supercapacitors and then fill the supercapacitors back up with the battery slowly; and then when I brake, I can capture more of that regen energy and do the supercapacitors faster. I think that just makes logical sense, because now all of a sudden I’ve got a sponge in front of my main energy source and I’m not stressing (the battery) so much,” Ellis said. 

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Simon is an experienced automotive reporter with a passion for electric cars and clean energy. Fascinated by the world envisioned by Elon Musk, he hopes to make it to Mars (at least as a tourist) someday. For stories or tips--or even to just say a simple hello--send a message to his email, simon@teslarati.com or his handle on X, @ResidentSponge.

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Elon Musk reveals Tesla’s next Robotaxi expansion in more ways than one

Tesla Robotaxi is growing in more ways than one. Tesla wants to expand and hopes to reach half the U.S. population by the end of the year.

Published

9 hours ago

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July 24, 2025

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Credit: Tesla

Tesla CEO Elon Musk revealed the company’s plans for its next expansion of the Robotaxi in terms of both the geofence in Austin and the platform overall, as it looks to move to new areas outside of Texas.

Tesla launched the Robotaxi platform last month on June 22, and has since expanded both the pool of users and the area that the driverless Model Y vehicles can travel within.

The first expansion of the geofence caught the attention of nearly everyone and became a huge headline as Tesla picked a very interesting shape for the new geofence, resembling male reproductive parts.

The next expansion will likely absolve this shape. Musk revealed last night that the new geofence will be “well in excess of what competitors are doing,” and it could happen “hopefully in a week or two.”

Musk’s full quote regarding the expansion of the geofence and the timing was:

“As some may have noted, we have already expanded our service area in Austin. It’s bigger and longer, and it’s going to get even bigger and longer. We are expecting to greatly increase the service area to well in excess of what competitors are doing, hopefully in a week or two.”

The expansion will not stop there, either. As Tesla has operated the Robotaxi platform in Austin for the past month, it has been working with regulators in other areas, like California, Arizona, Nevada, and Florida, to get the driverless ride-hailing system activated in more U.S. states.

Tesla confirmed that they are in talks with each of these states regarding the potential expansion of Robotaxi.

Musk added:

“As we get the approvals and prove out safety, we will be launching the autonomous ride-hailing across most of the country. I think we will probably have autonomous ride-hailing in probably half the population of the US by the end of the year.”

We know that Tesla and Musk have been prone to aggressive and sometimes outlandish timelines regarding self-driving technology specifically. Regulatory approvals could happen by the end of the year in several areas, and working on these large metros is the best way to reach half of the U.S. population.

Tesla said its expansion of the geofence in Austin is conservative and controlled due to its obsession with safety, even admitting at one point during the Earnings Call that they are being “paranoid.” Expanding the geofence is necessary, but Tesla realizes any significant mistake by Robotaxi could take it back to square one.

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Tesla warns customers of incentive strategy on EVs as tax credit nears end

If you’re thinking of buying a Tesla, the time to order is now, the company claimed.

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10 hours ago

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July 24, 2025

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(Credit: Tesla)

Tesla has warned customers about its incentive strategy for qualifying electric vehicles, as the days of both the $7,500 EV tax credit for new EVs and the $4,000 credit for used EVs are coming to a close.

Both tax credits, which impact some of the vehicles in the Tesla lineup, are set to be eliminated at the end of Q3. The phase out of these consumer credits was always in the plans of the Trump Administration, but now we’re in the final quarter of their existence.

As a result, EV companies are scrambling to see how they can reduce costs or make their vehicles more affordable for customers. The $7,500 will price many consumers out of many EVs on the market, and Tesla is not immune to that.

However, Tesla has made a significant push into Q3 deliveries, rolling out numerous incentives to customers, including 0% APR on select purchases, lease deals, free upgrades on certain inventory units, and more.

The extensive list of incentives on Tesla vehicles in the quarter will not get any longer, either. During last night’s Tesla Earnings Call for the second quarter of 2025, company executives stated that their intention for these incentives was to encourage customers to place orders early in the quarter.

Tesla will only be able to apply the $7,500 credit with deliveries that occur before the end of September. Even if an order is placed before then, delivery must be completed by September 31 to receive the tax credit.

CFO Vaibhav Taneja confirmed that the incentives for the quarter are already out and encouraged customers to place an order sooner rather than later:

“Given the abrupt change, we have a limited supply of vehicles in the US this quarter. As we are already within lead times to order parts for cars, we have rolled out all our planned incentives already and will start pairing them back as we start to sell. If you are in the US and looking to buy a car, let’s roll now as we may not be able to guarantee delivery for orders placed in the later part of August and beyond.”

The loss of the incentives will impact every EV maker in the United States. Tesla has a plan moving forward, and it said last night that its affordable models would be rolled out in Q4, as introducing these cars any earlier could have detrimental effects on Model 3 and Model Y sales.

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Tesla Model Y awarded Top Safety Pick+ from IIHS

The new Model Y continues to impress with this new award.

Published

12 hours ago

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July 24, 2025

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(Credit: Tesla)

The 2025 Tesla Model Y was one of two midsize luxury SUVs to receive the Top Safety Pick+ award from the Insurance Institute for Highway Safety (IIHS).

To qualify for the IIHS’s Top Safety Pick+ or even the lower-tier Top Safety Pick label, vehicles need good ratings in the small overlap front and side crash tests, an acceptable or good rating in the pedestrian front crash prevention evaluation, and acceptable or good ratings for headlights across all trim levels.

The difference between the two labels is that an “Acceptable” rating in the moderate overlap front test will get a car the Top Safety Pick rating, but a “Good” rating in this category will win the elusive Top Safety Pick+ category.

The 2025 Model Y, codenamed “Juniper” internally by Tesla, was released in the United States earlier this year and received the top rating across each of the categories, automatically qualifying it for the Top Safety Pick+ label:

Other vehicles in Tesla’s lineup have extraordinary marks in crash testing according to other agencies, like the National Highway Traffic Safety Administration (NHTSA), but there are reasons those cars are not on the IIHS lists.

In 2024, we reported that the IIHS had evaluated some Tesla vehicles for the necessary tests to achieve these marks. Joe Young of the agency told us that the Model 3, for example, was not featured on either the Top Safety Pick or Top Safety Pick+ lists because the vehicle had several missing tests.

Here’s why the Tesla Model 3 wasn’t an IIHS Top Safety Pick+, and why it could be soon

This is not to say those other Tesla vehicles would not perform well. The Cybertruck performed better than any pickup has ever in NHTSA crash testing assessments.

The Model Y is Tesla’s most popular vehicle and was the best-selling car in the world over the past two years. Tesla’s intense focus on safety continues to show that this priority goes into every decision the company makes regarding design and engineering. This focus has continued to pay dividends as some real-world crashes save the lives of those inside the cars.

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