News
How Tesla Battery Day can silence critics once and for all
The hype surrounding Tesla’s Battery Day is very real. Enthusiasts and unknowns are talking about the potential findings that Elon Musk and his crew could unveil on September 22nd, and the event could make way for Tesla to become much larger than it already is. However, there is a good chance that the critics of the electric automaker will have little to say after the event, and if Tesla plays it right, it could be the beginning of the end of the Tesla FUD (Fear, Uncertainty, Doubt) movement.
It is understandable to assume that Tesla doubters will always exist. Some companies that have the best intentions still have their haters, and that’s just human nature. While Tesla will always have people who will doubt its intentions as a company, Battery Day could be the proverbial duct tape over the lips of the most vocal skeptics.
Tesla still has work to do, and Battery Day’s total appeal comes down to whether the company can manage to live up to the hype. Many rumors are circulating around what Elon Musk could unveil at the event, some related to batteries, and some aren’t. But whatever happens, it really comes down to the “Wow” factor, and whether Tesla can manage to attain that with their findings and unveilings.
To me, the most significant thing Tesla could announce is price parity, and something that is relatively an extra is the possibility that Musk could unveil the Plaid Powertrain. But if the company really wants to make a mark, several things, in my opinion, have to be confronted during the event.
Million-Mile Battery
Tesla’s Million-Mile Battery is almost certainly the most confirmed element of Battery Day. Developments from Jeff Dahn and his team of researchers have come up big for Tesla recently with electrolyte solutions and new studies that show revolutionary energy density measures. Reports across the globe have essentially confirmed that Tesla will unveil this development at the event, and it will be a big win for the electric automaker.
Having a battery that will last as long as two or three vehicle chassis means that when the increased longevity is combined with increasing production, Tesla will have a relatively large-scale supply of batteries available at their disposal. This opens the doors for many things, including price parity and the possibility of becoming a supplier for other electric car companies.
Price Parity…or close to it
Price parity with gas cars wouldn’t only be monumental for Tesla, but for EVs in general. It would prove that gas cars are not always going to be the most economical option for drivers, and the price of battery-powered cars would drop. Having Tesla announce price parity or something close would mean the premium EV brand would have the most affordable vehicles in terms of EV tech and range. It could mean the company’s growth may accelerate much quicker than initially anticipated. If the cars are cheaper, a lot of people will buy them, obviously. While $35,000 is reasonable for the Model 3 Standard Range, many people still are unwilling to spend that much on any car.
Getting the price of batteries down would literally begin the destruction of legacy automakers as if it hasn’t already started. Tesla being the best EV brand and having the best prices per kWh would be so massive, I don’t think many people can begin to fathom the possibilities.
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Status as a cell supplier for other companies
If Tesla can figure out price parity and long lifespan battery cells, the company will be well on its way to becoming a battery supplier. Long term battery life, combined with affordability, will be a big plus for Tesla’s plans to become a supplier for other EV brands. Having cheap batteries that are high-quality and offer an extended lifespan will be a no brainer. Tesla’s most notable competitors will be forced to source their cells from the Silicon Valley-based company.
Plaid Powertrain for the Model S
The Plaid Powertrain has been highly-anticipated for about a year, and there is a good chance Tesla unveils it at Battery Day. It seems that the issue with putting it into production last year was along the same lines as putting the Semi into production too early: battery shortages. The Plaid Powertrain will have a larger pack, meaning more cells, and putting it on Tesla’s menu too early would have spoiled their plans for the cars that are more crucial to the future of the company. The Model 3 is an excellent example of this. It’s a mass-market car, and the batteries should go toward these efforts instead of a sedan that has increased performance.
The Semi was not put into production because battery cells were not plentiful enough. Creating the Semi and fulfilling the preorders that the company had would have been troublesome for Tesla’s mass-market vehicle push, and it certainly wouldn’t have been the smartest strategy. However, Musk said that a “volume production” push of the Semi needed to occur soon, which basically confirms that the shortage is no longer an issue. The Plaid Powertrain will likely be the next piece of Tesla’s puzzle to be announced.
Is there the possibility that Tesla will shock us with something completely unexpected?
Of course, we’re talking about Elon Musk. The guy that unveiled the next-Gen Roadster as a surprise and the guy that rolled off a Cyberquad after the Cybertruck unveiling. While those are just a vehicle and a four-wheeler, we’re talking about Tesla’s most anticipated event, perhaps ever. There is a lot of potential for groundbreaking announcements next Tuesday, and there is no shortage of things that Musk could announce.
He has said on numerous occasions that Battery Day is going to be insanity and that it will likely blow a lot of minds. But what will transpire exactly, only a few people really know, and there is little sense in trying to guess what Musk will have for us on September 22nd.
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News
Tesla removes Safety Monitors, begins fully autonomous Robotaxi testing
This development, in terms of the Robotaxi program, is massive. Tesla has been working incredibly hard to expand its fleet of Robotaxi vehicles to accommodate the considerable demand it has experienced for the platform.
Tesla has started Robotaxi testing in Austin, Texas, without any vehicle occupants, the company’s CEO Elon Musk confirmed on Sunday. Two Tesla Model Y Robotaxi units were spotted in Austin traveling on public roads with nobody in the car.
The testing phase begins just a week after Musk confirmed that Tesla would be removing Safety Monitors from its vehicles “within the next three weeks.” Tesla has been working to initiate driverless rides by the end of the year since the Robotaxi fleet was launched back in June.
Two units were spotted, with the first being seen from the side and clearly showing no human beings inside the cabin of the Model Y Robotaxi:
A Tesla without a driver was spotted traveling on public roads! pic.twitter.com/ZLbduf4cKa
— TESLARATI (@Teslarati) December 14, 2025
Another unit, which is the same color but was confirmed as a different vehicle, was spotted just a few moments later:
NEWS: A second Tesla Model Y Robotaxi running FSD Unsupervised has just been spotted driving itself on public roads in Austin, Texas, with no one in the front seats.
This is a different car from the one spotted earlier. They have different license plates.
h/t @Mandablorian https://t.co/5URYsUGyD0 pic.twitter.com/CIUi4mXi33
— Sawyer Merritt (@SawyerMerritt) December 14, 2025
The two units are traveling in the general vicinity of the South Congress and Dawson neighborhoods of downtown Austin. These are located on the southside of the city.
This development, in terms of the Robotaxi program, is massive. Tesla has been working incredibly hard to expand its fleet of Robotaxi vehicles to accommodate the considerable demand it has experienced for the platform.
However, the main focus of the Robotaxi program since its launch in the Summer was to remove Safety Monitors and initiate completely driverless rides. This effort is close to becoming a reality, and the efforts of the company are coming to fruition.
Testing is underway with no occupants in the car
— Elon Musk (@elonmusk) December 14, 2025
It is a drastic step in the company’s trek for self-driving technology, as it plans to expand it to passenger vehicles in the coming years. Tesla owners have plenty of experience with the Full Self-Driving suite, which is not fully autonomous, but is consistently ranked among the best-performing platforms in the world.
News
Tesla refines Full Self-Driving, latest update impresses where it last came up short
We were able to go out and test it pretty extensively on Saturday, and the changes Tesla made from the previous version were incredibly impressive, especially considering it seemed to excel where it last came up short.
Tesla released Full Self-Driving v14.2.1.25 on Friday night to Early Access Program (EAP) members. It came as a surprise, as it was paired with the release of the Holiday Update.
We were able to go out and test it pretty extensively on Saturday, and the changes Tesla made from the previous version were incredibly impressive, especially considering it seemed to excel where it last came up short.
Tesla supplements Holiday Update by sneaking in new Full Self-Driving version
With Tesla Full Self-Driving v14.2.1, there were some serious regressions. Speed Profiles were overtinkered with, causing some modes to behave in a strange manner. Hurry Mode was the most evident, as it refused to go more than 10 MPH over the speed limit on freeways.
It would routinely hold up traffic at this speed, and flipping it into Mad Max mode was sort of over the top. Hurry is what I use most frequently, and it had become somewhat unusable with v14.2.1.
It seemed as if Speed Profiles should be more associated with both passing and lane-changing frequency. Capping speeds does not help as it can impede the flow of traffic. When FSD travels at the speed of other traffic, it is much more effective and less disruptive.
With v14.2.1.25, there were three noticeable changes that improved its performance significantly: Speed Profile refinements, lane change confidence, and Speed Limit recognition.
🚨 Many of you asked us to test highway driving with Tesla Full Self-Driving v14.2.1.25. Here’s what we noticed:
✅ Speed Profiles are significantly improved. Hurry Mode is no longer capped at 10 MPH over the speed limit, and now travels with the flow of traffic. This is much… pic.twitter.com/48ZCGbW0JO
— TESLARATI (@Teslarati) December 13, 2025
Speed Profile Refinement
Speed Profiles have been significantly improved. Hurry Mode is no longer capped at 10 MPH over the speed limit and now travels with the flow of traffic. This is much more comfortable during highway operation, and I was not required to intervene at any point.
With v14.2.1, I was sometimes assisting it with lane changes, and felt it was in the wrong place at the wrong time more frequently than ever before.
However, this was one of the best-performing FSD versions in recent memory, and I really did not have any complaints on the highway. Speed, maneuvering, lane switching, routing, and aggressiveness were all perfect.
Lane Changes
v14.2.1 had a tendency to be a little more timid when changing lanes, which was sort of frustrating at times. When the car decides to change lanes and turn on its signal, it needs to pull the trigger and change lanes.
It also changed lanes at extremely unnecessary times, which was a real frustration.
There were no issues today on v14.2.1.25; lane changes were super confident, executed at the correct time, and in the correct fashion. It made good decisions on when to get into the right lane when proceeding toward its exit.
It was one of the first times in a while that I did not feel as if I needed to nudge it to change lanes. I was very impressed.
Speed Limit Recognition
So, this is a complex issue. With v14.2.1, there were many times when it would see a Speed Limit sign that was not meant for the car (one catered for tractor trailers, for example) or even a route sign, and it would incorrectly adjust the speed. It did this on the highway several times, mistaking a Route 30 sign for a 30 MPH sign, then beginning to decelerate from 55 MPH to 30 MPH on the highway.
This required an intervention. I also had an issue leaving a drive-thru Christmas lights display, where the owners of the private property had a 15 MPH sign posted nearly every 200 yards for about a mile and a half.
The car identified it as a 55 MPH sign and sped up significantly. This caused an intervention, and I had to drive manually.
It seems like FSD v14.2.1.25 is now less reliant on the signage (maybe because it was incorrectly labeling it) and more reliant on map data or the behavior of nearby traffic.
A good example was on the highway today: despite the car reading that Route 30 sign and the Speed Limit sign on the center screen reading 30 MPH, the car did not decelerate. It continued at the same speed, but I’m not sure if that’s because of traffic or map data:
🚨 We listened to and read a lot of you who had a complaint of Tesla Full Self-Driving v14.2.1 incorrectly reading Speed Limit signs
This appears to be resolved in v14.2.1.25.
Here’s a breakdown: pic.twitter.com/TEP03xrMbt
— TESLARATI (@Teslarati) December 13, 2025
A Lone Complaint
Tesla has said future updates will include parking improvements, and I’m really anxious for them, because parking is not great. I’ve had some real issues with it over the past couple of months.
Today was no different:
🚨 My lone complaint with my drive on Tesla FSD v14.2.1.25 was this strange parking instance.
FSD swung out wide to the left to pull into this spot and this is where it seemed to be stumped. I gave it about 10 seconds after the car just stopped moving for it to make some… https://t.co/ZEkhTHOihG pic.twitter.com/TRemXu5DLf
— TESLARATI (@Teslarati) December 13, 2025
Full Self-Driving v14.2.1.25 is really a massive improvement over past versions, and it seems apparent that Tesla took its time with fixing the bugs, especially with highway operation on v14.2.1.
News
Tesla hints at Starlink integration with recent patent
“By employing polymer blends, some examples enable RF transmission from all the modules to satellites and other communication devices both inside and outside the vehicle.”
Tesla hinted at a potential Starlink internet terminal integration within its vehicles in a recent patent, which describes a vehicle roof assembly with integrated radio frequency (RF) transparency.
The patent, which is Pub. No U.S. 2025/0368267 describes a new vehicle roof that is made of RF-transparent polymer materials, allowing and “facilitating clear communication with external devices and satellites.”
Tesla believes that a new vehicle roof design, comprised of different materials than the standard metallic or glass elements used in cars today, would allow the company to integrate modern vehicular technologies, “particularly those requiring radio frequency transmission and reception.
Tesla has recently filed a US patent application on integrating RF transparent materials into the roof structure.
“facilitating clear communication with external devices and satellites”
Tesla fleet is getting @Starlink connectivity integration soon. LFG @Tesla @elonmusk… pic.twitter.com/bLa8YtPLd1
— Chansoo Byeon (@Chansoo) December 9, 2025
Instead of glass or metallic materials, Tesla says vehicles may benefit from high-strength polymer blends, such as Polycarbonate, Acrylonitrile Butadiene Styrene, or Acrylonitrile Styrene Acrylate.
These materials still provide ideal strength metrics for crashworthiness, stiffness for noise, vibration, and harshness control, and are compliant with head impact regulations.
They would also enable better performance with modern technologies, like internet terminals, which need an uninterrupted signal to satellites for maximum reception. Tesla writes in the patent:
“By employing polymer blends, some examples enable RF transmission from all the modules to satellites and other communication devices both inside and outside the vehicle.”
One of the challenges Tesla seems to be aware of with this type of roof design is the fact that it will still have to enable safety and keep that at the forefront of the design. As you can see in the illustration above, Tesla plans to use four layers to increase safety and rigidity, while also combating noise and vibration.
It notes in the patent that disclosed examples still meet the safety requirements outlined in the Federal Motor Vehicle Safety Standards (FMVSS).
Starlink integrated directly into Tesla vehicles would be a considerable advantage for owners. It would come with a handful of distinct advantages.
Initially, the inclusion of Starlink would completely eliminate cellular dead zones, something that is an issue, especially in rural areas. Starlink would provide connectivity in these remote regions and would ensure uninterrupted service during road trips and off-grid adventures.
It could also be a critical addition for Robotaxi, as it is crucial to have solid and reliable connectivity for remote monitoring and fleet management.
Starlink’s growing constellation, thanks to SpaceX’s routine and frequent launch schedule, will provide secure, stable, and reliable internet connectivity for Tesla vehicles.
Although many owners have already mounted Starlink Mini dishes under their glass roofs for a similar experience, it may be integrated directly into Teslas in the coming years, either as an upgrade or a standard feature.
Tesla removes Safety Monitors, begins fully autonomous Robotaxi testing
Tesla refines Full Self-Driving, latest update impresses where it last came up short
