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Tesla 4680 cells compared with BYD Blade and CATL Qilin structural batteries
The battle for the dominance of the electric vehicle sector would likely be determined by the market’s key battery makers. With this in mind, companies such as BYD, CATL, and Tesla — all of whom are exploring the structural battery form factor — have the chance to become the trailblazers of the next generation of electric car batteries.
During its Battery Day event, Tesla announced its 4680 cells, which are used alongside the company’s structural battery pack. BYD, on the other hand, has also released its Blade batteries, which also adopt a non-modular approach. CATL’s Qilin batteries are in the same segment, with its structural battery design.
Electric vehicle battery enthusiast Jordan Giesige of YouTube’s The Limiting Factor channel recently conducted a comparison of the advantages and disadvantages of Tesla, BYD, and CATL’s next-generation structural packs. Each battery pack was evaluated according to several factors, such as design, rigidity, packing and energy density, and safety, before being ranked. It should be noted that the figures used in the comparisons are drawn from estimates and materials released by Tesla, BYD, and CATL themselves, not current real-world observations.
As noted by Giesige, Tesla’s 4680 structural battery packs utilize hundreds of cylindrical cells with a cooling ribbon in between every other row of cells. A lid is then placed on top and polyurethane foam is injected into the pack. This polyurethane hardens, and the combination of the foam and the battery cells forms a rigid, honeycomb-type structure.
CATL Qilin batteries, which could be fitted with both nickel and iron-based cells, integrate thermal pads, the liquid cooling plate, and the cross bracing to create what could be described as structural cooling. The structural cooling is placed between each row of prismatic battery cells, and the cells themselves are placed into the pack directly without any modules. BYD Blade batteries use iron-based prismatic cells, though these cells are longer and thinner than those used by CATL. The cells are then stretched across the BYD Blade battery pack, allowing the cells themselves to replace conventional steel beams.

In the rankings of the next-generation batteries, the YouTube host noted that Tesla’s 4680 structural battery pack would likely be the most rigid among its peers. Tesla’s 4680 pack loses out in terms of packing density, however, as BYD and CATL’s use of prismatic cells maximizes volumetric energy density. With this in mind, and considering that CATL’s Qilin batteries can be fitted with high-energy density nickel-based cells, a nickel-based Qilin battery would likely be more energy dense than a nickel-based Tesla 4680 pack or a BYD Blade structural battery, which uses less energy dense iron-based cells.
As for cooling, Giesige noted that the BYD Blade batteries’ plate cooling would likely fall short of the Tesla 4680 pack and CATL Qilin battery’s cooling systems. In its marketing materials, CATL highlighted that cooling the sides of the Qilin battery increases the pack’s cooling area four times. Tesla’s 4680 battery also uses better cooling than BYD’s Blade batteries with its side cooling system, though it would likely not be as good as the cooling of CATL’s Qilin structural packs.
While BYD’s Blade batteries lose out in cooling, they are also likely the safest among its peers. This is because the BYD Blade battery uses iron-based cells, which have a higher decomposition and lower heat release temperature than the nickel-based cells used in Tesla’s 4680 cells and CATL’s nickel-based Qilin batteries. An iron-based Qilin battery comes second to the BYD Blade, partly due to its use of shorter and thicker prismatic cells, which may trap more heat.
A Qilin pack with nickel-based cells was ranked last in terms of safety by the battery enthusiast, as Tesla’s 4680 pack with nickel-based cells features several safety systems, such as an overpressure mechanism on the bottom of the cells themselves. Since 4680 cells are also smaller than the prismatic cells used in the BYD Blade and CATL Qilin, they contain less energy. The 4680 cells themselves are enclosed in a thick shell as well, which are about 2-3 times thicker than a conventional battery.
Overall, Giesige noted that Tesla’s 4680 cells are likely the best all-rounder compared to its peers in the structural battery segment. The overall scores of the BYD Blade and CATL Qilin batteries bode well for Tesla’s future, however, as the companies could become suppliers of the EV maker in the future. CATL is already supplying Tesla with LFP batteries today, and BYD is heavily rumored to be a Tesla supplier as well. In a way, the analysis of the next-generation structural EV batteries shows that Tesla is not alone in pushing the battery industry forward.
Watch The Limiting Factor‘s full analysis in the video below.
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Tesla Robotaxi just got a big benefit from the U.S. government
The NHTSA is looking to help streamline the application process for companies developing driverless vehicles.

Tesla Robotaxi just got a big benefit from the U.S. Government, as the National Highway Traffic Safety Administration (NHTSA) is looking to ease some rules and streamline the application process that could hinder the development and licensing of autonomous vehicles.
Tesla is set to launch its Robotaxi platform in the coming days or weeks, but regulation on autonomous vehicles is incredibly slim, so automakers are left in a strange limbo as permissions to operate are usually up to local jurisdictions.
The NHTSA still has the ultimate say, but it is now adopting a new strategy that will see companies gain an exemption from federal safety standards and streamline the entire application process.
The agency is authorized to grant exemptions to permit manufacturers to produce vehicles over a two or three-year period that might not comply with certain Federal Motor Vehicle Safety Standards (FMVSS). Robotaxi, for example, will eventually not have a steering wheel or pedals, through the Cybercab that Tesla unveiled last October.
The exemption program the NHTSA announced today would be possible through Part 555 of the National Traffic and Motor Vehicle Safety Act:
“NHTSA may grant a Part 555 exemption if at least one of four bases listed in the statute is met and NHTSA determines that the exemption is consistent with the public interest and the Safety Act. The statute also authorizes NHTSA to subject an exemption to terms the agency deems appropriate and requires that NHTSA publish notice of the application and provide an opportunity to comment.”
The rapid and non-stop innovation that is being performed is tough to keep up with from a legal standpoint. The NHTSA recognizes this and says current legislation is appropriate for traditional vehicles, but not for the self-driving cars companies are producing now:
“The current Part 555 process was designed for traditional vehicles. As currently applied, this process is not well suited for processing exemptions involving ADS-equipped vehicles in a timely manner or overseeing the unique complexities involving their operations. This has resulted in long processing times for applications for ADS-equipped vehicles. NHTSA must improve its Part 555 processing times substantially to keep pace with the rapid innovation of the ADS industry and to ensure that exemptions remain effective tools for nurturing groundbreaking safety technologies.”
Now, the NHTSA will be “enhancing application instructions” to help manufacturers understand the requirements involved in the application process. This will streamline the entire process by “reducing the need for NHTSA to request additional information from the manufacturer,” the agency says.
First Tesla driverless robotaxi spotted in the wild in Austin, TX
Next, the NHTSA is going to have a more flexible approach to evaluating exemptions for ADS-equipped vehicles:
“To build flexibility into the Part 555 process while also accounting for the unique aspects of those exemptions, NHTSA intends to develop terms that could be included in Part 555 exemption grants, when appropriate, to condition operations of exempted ADS-equipped vehicles on enhanced and continuing oversight from NHTSA. NHTSA would expect to administer this enhanced oversight through letters, which could be updated over time, mirroring real-world ADS development. This will enable NHTSA to focus its initial review during the application stage and align the Part 555 oversight approach more closely to exemptions administered under NHTSA’s Automated Vehicle Exemption Program (AVEP), which have proven effective for ADS.”
This will benefit any company making autonomous vehicles, but it will especially benefit Tesla in the short-term as it is readying for the launch of Robotaxi.
Tesla is trading up 1.89 percent at the time of publication.
Part 555 Letter June 2025 by Joey Klender on Scribd
News
SpaceX produces its 10 millionth Starlink kit
The first 5 million Starlink kits took nearly four years to build.

SpaceX has achieved a major milestone, producing its 10 millionth Starlink kit. The accomplishment was celebrated across the company’s Hawthorne, California, and Bastrop, Texas, facilities.
The milestone was shared in social media by Sujay Soman, Senior Facilities Engineer, in a LinkedIn post, which has since been deleted.
Starlink Production Ramp
Soman noted in his LinkedIn post that the first 5 million Starlink kits took nearly four years to build, but the next 5 million kits were completed in just 11 months. This underscores SpaceX’s intense efforts to ramp up the satellite internet system’s production, and it reflects the private space company’s manufacturing prowess.
The SpaceX Senior Facilities Engineer shared a couple of photos of the Machine Maintenance and Facilities team in Bastrop to commemorate the event.
“Today, Starlink Product teams across our Hawthorne and Bastrop sites produced the 10th Million Starlink Kit! It took almost 4 years to build our first 5 million kits, and we doubled that in about 11 months. Monumental accomplishment!” Soman wrote in his post.

World-Changing Technology
The Starlink kits, featuring dish hardware and supporting equipment, enable users to connect to the company’s growing constellation of low Earth orbit satellites. With over 6,000 satellites launched to date, Starlink now provides fast and reliable internet connectivity to over 6 million customers worldwide. This was a significant increase from the 5 million customers that the company reported in February 2025.
SpaceX has not detailed its next production targets, but the production of Starlink’s 10 millionth kit milestone signals the company’s readiness to scale further. Being an Elon Musk-led company, SpaceX is arguably the best in the business when it comes to efficient and cost-effective manufacturing. It would then be unsurprising if SpaceX announces another Starlink production milestone soon.
News
Tesla retires yoke steering wheel in base Model S and X
Tesla’s controversial steering yoke is now exclusive to the Model S and Model X Plaid.

Tesla has closed a chapter in the saga of the Model S and Model X’s controversial steering yoke. Following the announcement of the new iterations of the flagship vehicles, Tesla promptly removed the steering option for the vehicles’ base variants.
This means that if drivers wish to experience the Model S or Model X with a yoke, they would have to go Plaid.
The new Model S and Model X
The refresh of the Model S and Model X were quite minor, with the two vehicles featuring a new front camera, a new color, and a handful of other small changes like new exterior styling for the Model S Plaid. Tesla also noted on its website that the two vehicles now have a much smoother and quieter ride.
The changes were quite polarizing, with some appreciating the subtle improvements made to the two flagship cars and others arguing that Tesla should have done more. Others, however, noted that the level of improvements implemented on the Model S and Model X would already be considered major refresh for a tech company like Apple.
No More Yoke Unless Plaid
When Tesla refreshed the Model S and Model X in 2021, the vehicles were released with a steering yoke as standard. The yoke was controversial, with critics stating that it was unsafe and fans stating that it made driving the Model S and Model X fun. Tesla later introduced a round steering wheel option for the Model S and Model X, which later became standard on the two flagship vehicles.
This remains true today, with the most recent versions of the Model S and Model X still being released with a round steering wheel as standard. Those who wish to experience the Model S and Model X Plaid as envisioned by the company and its CEO, Elon Musk, however, might find it a good idea to spend the extra $1,000 for the vehicles’ yoke steering wheel.
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