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Tesla Semi battery weight criticisms are rooted in outdated ideas: EV expert

The Tesla Semi visits Yandell Truckaway. (Photo: Arash Malek)

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5 years ago

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A good number of skeptics critical of battery-electric long-haulers like the Tesla Semi typically argue that the weight of the vehicles’ batteries makes them ineffective against competitors that are powered by diesel or hydrogen. As noted by an electric vehicle veteran and expert recently, however, these ideas are rooted in outdated ideas about battery weight. And if one considers more recent battery tech, electric Class 8 trucks may not only be feasible; they may actually be closer than expected. 

In a recent piece on Bulk Distributor Magazine’s November/December 2020 issue, Auke Hoekstra, Senior Advisor for Electric Mobility at the Eindhoven University of Technology, noted that contrary to popular belief, long-haul trucks would not be the last vehicles to become battery-powered. This is in no small part due to the advancement of battery technology. Hoekstra noted that within five years, he believes that “electric trucks will become the logical choice for many bulk transporters” And within 10 years, vehicles like the Tesla Sei will likely dominate new sales. 

The stunning progression of battery technology could be seen in just how much batteries have gotten better and cheaper over the years. Hoekstra noted that myths about electric trucks being too heavy were true 20 years ago, but not today. If electric long-haulers existed 20 years ago, they would likely be powered by lead-acid batteries, and assuming a battery size of 1 MWh, such a vehicle will require a pack that will likely weigh about 25 tons. That’s more than the entire payload of the truck. This is, of course, not the case today. 

Hoekstra noted that when he wrote his first book about electric vehicles for the Dutch Ministry of Road Transport 13 years ago, lithium-ion batteries had started to emerge. Lithium-ion batteries offered reductions in weight, resulting in a 1 MWh pack weighing only about 10 tons. Today, this is even better, with modern electric cars having batteries that weigh about 5 kg per kWh or 5 tons per MWh. “I expect that with five years, that weight will be down to 3.5 tons. And it doesn’t stop there,” the EV veteran wrote. 

Class 8 trucks like the Tesla Semi, which are designed from the ground up to be electric, will likely offer even better weight advantages. Hoekstra estimated that Tesla would see further weight reductions of about 2.5 to 3 tons due to the vehicle’s all-electric platform. “The electric motor is lighter, and you can get rid of the diesel tank and exhaust treatment. Then you place the electric motors between the wheels and lose the differential, driveshaft, and a host of other components,” he wrote. 

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What’s particularly interesting is that these estimates don’t even take into account the innovations that Tesla unveiled in its Battery Day event. Once Tesla’s 4680 tabless cells and structural battery packs enter the equation, the Semi becomes an even more compelling alternative to diesel-powered trucks. Hoekstra estimated that Tesla’s structural battery packs could save another ton to the Semi’s overall weight, seeing as the battery would practically displace the steel beams that give traditional Class 8 long-haulers their rigidity. With this in mind, the EV veteran noted that “battery weight will soon be a problem of the past.” 

There are other advantages to electric trucks that were highlighted by Hoekstra in his piece, such as the cost savings that will result from the use of a fleet of electric trucks. This is something that Tesla has highlighted in the past, with CEO Elon Musk stating during the vehicle’s unveiling that the Semi will vastly undercut diesel-powered rivals when it comes to operating costs. Couple this with the low maintenance requirements of EVs, as well as the fact that batteries now last much longer, and trucks like the Tesla Semi will likely become very attractive options for operators in the very near future. 

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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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Tesla’s Elon Musk considers insane Cybertruck mod: ‘Maybe we should make this’

The Cybertruck won’t do what the video shows (at least not in our lifetime), but a very entry-level version of it could be developed.

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5 hours ago

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August 19, 2025

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Credit: Cybertruck | X

Tesla CEO Elon Musk has teased what could potentially be the company’s next big project, and while it is likely many, many years away, it shows the company truly has its sights set on the craziest things the world has seen.

Musk shared a video created by Grok Imagine, the AI tool that is able to take images and turn them into videos, showing a Cybertruck flying above the clouds and buildings of what appears to be a very futuristic city.

There are also massive robots roaming around in the video, so it is obviously an illustration of what life could look like in several generations.

However, Musk, who does not shy away from some really optimistic projects and goals, shared the video on X and said, “Maybe Tesla should make this.”

What is depicted in the video is not what we’d see Tesla create anytime soon. However, the company could potentially engineer something to make the Cybertruck hover, as it plans to do with the Roadster.

Of course, this is likely a huge “if” considering the current state of the car industry. Vehicles are becoming more advanced with every passing day as companies like Tesla, Waymo, and others are working to sort out things like autonomous and driverless travel.

Tesla has been working on somewhat of a similar idea with the Roadster, a vehicle that has been delayed on several occasions because of Musk’s spectacular imagination. Earlier this year, Tesla’s Chief Designer, Franz von Holzhausen, revealed Musk wanted to push the limits of that vehicle even more.

The new Tesla Roadster will be able to fly: Elon Musk

It seems it could be on the way soon, considering Tesla has teased an “epic” demo for the car, which could come before the end of the year.

Tesla has been working to make the Roadster hover, using SpaceX cold gas thrusters. It will also utilize these for what could be an incredibly fast 1.1-second 0-60 MPH acceleration rate that has been teased countless times.

This project that Musk is teasing with the Cybertruck is likely one that we will not see in our lifetimes. However, this is just one example of the outlandish ideas Musk continues to tease for Tesla in the future.

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Tesla Model Y L addresses one huge complaint from many owners

If you have ever used a wireless charger inside a Tesla or almost any vehicle, for that matter, you will notice that your phone will charge slowly, and it will get extremely hot. This is mostly due to the inherent inefficiency of electromagnetic induction, which is the process that wireless chargers use to transfer energy to the phone.

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8 hours ago

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August 19, 2025

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The new Tesla Model Y L is officially launching in China at a great price and with all of the awesome features of the original model, but with more space. The vehicle is also addressing one huge complaint that many owners have discussed.

The new Model Y L features a more spacious interior, new front seats with adjustable headrests, captains chairs, and mechanical armrests in the second row, and B Pillar air vents for improved circulation.

Tesla Model Y L officially launched: price, features, and more

However, there are some other features that are flying under the radar, including one that addresses a common complaint of many Tesla owners: wireless charging.

If you have ever used a wireless charger inside a Tesla or almost any vehicle, for that matter, you will notice that your phone will charge slowly, and it will get extremely hot. This is mostly due to the inherent inefficiency of electromagnetic induction, which is the process that wireless chargers use to transfer energy to the phone.

The inefficiency is evident in the heat, as that is the lost energy that should be going to the phone, but does not.

To combat this problem, Tesla has rolled out a new feature with the wireless charging mat in the Model Y L.

Tesla has used small slit air vents in the center of the wireless charger, which separates the two pads, to blow cool air on the phones to prevent overheating:

This will keep the temperature of your phone down and could prevent the dreaded “iPhone too hot” message that deems your device unusable until it reaches a more stable temperature.

Additionally, Tesla has upgraded the driver’s side wireless charger to support 50W charging speeds. The passenger charger remains at 30W.

This is a small but valuable improvement to the wireless charging apparatus could be a game changer, as there have been so many complaints about this feature in other Tesla vehicles.

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Tesla Model Y Performance zips around Nurburgring with new features

With the performance, there are some improvements to interior aesthetics, but the goal with this particular trim of Tesla vehicles is to improve performance and aerodynamics, bringing a truly first-class experience to one of the best and fastest vehicles on the road.

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10 hours ago

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August 19, 2025

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Credit: Wilco Blok on Instagram

The long-awaited Tesla Model Y Performance has been spotted zipping around the famed Nurburgring in Germany, a popular location for new vehicles to test their limits ahead of public release.

Earlier this year, Tesla executives Franz von Holzhausen and Lars Moravy both indicated that the updated and upgraded Model Y Performance would be on its way by the end of 2025, and it appears that time is coming close.

New images captured by Wilco Blok and Teslaplaidtokde on X show the Model Y Performance wrapped in camouflage, sporting a handful of new features as the lightning-fast version of the world’s best-selling vehicle prepares for a launch in various markets across the world:

New Features

According to Blok and Teslaplaidtokde, the new Model Y Performance will feature a variety of new improvements compared to the past version.

This is something that was expected, as the launch of the new Model Y over the past year has shown various changes that made a great vehicle even better.

With the performance, there are some improvements to interior aesthetics, but the goal with this particular trim of Tesla vehicles is to improve performance and aerodynamics, bringing a truly first-class experience to one of the best and fastest vehicles on the road.

 

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A post shared by ᴡɪʟᴄᴏ ʙʟᴏᴋ (@wilcoblok)

Here’s what was mentioned as changes so far that have been seen on this test mule at Nurburgring:

  • New 21″ wheels
  • All black headliner, a big change that was included in the Model Y L, the first time a Model Y has had that option
  • Updated brakes
  • Bucket seats that appear to be similar to the new Model Y L in China
  • New Carbon Fiber Spoiler
  • Performance Badging
  • Changes to both the front and rear bumper
  • Suspension with Adaptive Dampers

 

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A post shared by ᴡɪʟᴄᴏ ʙʟᴏᴋ (@wilcoblok)

Expected Performance Metrics

These are not official figures, but this is what is expected based on what has been seen at the Nurburgring:

  • 510 horsepower
  • 0-60 MPH in 3.2-3.4 seconds
  • 280-290 miles of range
  • Anticipating the release of a new Track Mode

The previous iteration of the Model Y Performance featured 503 horsepower and a 0-60 MPH of 3.5 seconds. It also had a top speed of 155, which we believe will be improved with the next version of the Y Performance.

Here is some footage of the Model Y Performance running around the Nurburgring ahead of its release:

Tesla has not yet listed any date or timeframe for the Performance variant to be released. However, it is anticipated to be released by the end of 2025.

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