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Elon Musk’s updates to Tesla Battery Day show we have no idea what will happen
Tesla’s Battery Day is less than a month away, and there is no shortage of speculation for what might be unveiled at the event. Numerous attempts to uncover subliminal messages within Tesla’s announcements and other related topics of discussion have been shot down by CEO Elon Musk, relatively confirming the fact that, as a community, we have no idea what will go down on September 22nd.
Battery Day is arguably Tesla’s most anticipated event because of the significance it holds for the company’s future development. Not only could Tesla revolutionize the way electric cars operate, but it could reveal the company’s plans to reach price parity with gas vehicles. What goes down on September 22nd is going to be huge, and the EV community as a whole will be watching.
Initially, several members of the EV community had uncovered the fact that Amprius Technologies Headquarters is located right across the street from Tesla’s Kato Road Facility in Fremont, California. In fact, CleanTechnica had even revealed that there could be a link between Tesla and Amprius in an article from August 26th.
There was plenty of evidence that Tesla could be using Amprius Technologies silicon nanowire tech for its new cell developments.
However, Musk immediately shot down any speculation of the two companies being linked.
But actually nothing. Was surprised to hear they’re across the road. Adding silicon to carbon anode makes sense. We already do. Question is just what ratio of silicon to carbon & what shape? Silicon expands like crazy during discharge & comes apart, so cycle life is usually bad.
— Elon Musk (@elonmusk) August 27, 2020
To add fuel to the fire, Tesla also released a cryptic background for its Battery Day and Shareholder Meeting Livestream page, which left many people interested in what the design could mean.
For example, Electrek indicated that doing a simple reverse lookup of the image on Google revealed that it also had a similar design to silicon nanowires, which also would relate Tesla to Amprius once again.
While the EV community has been baffled by what the design is for the Battery Day and Shareholder, Musk finally provided an update on the image.
“We were too obtuse for our own good, although I think it works aesthetically,” Musk said in a Tweet that was in response to an inquiry from @WholeMarsBlog. “Those are folded-over current collectors at the top/bottom of the cell, which are important, but I don’t want to jump the gun on Sept 22,” he added.
Current collectors are crucial for enhancing the electrochemical performance of a lithium-ion battery cell. Usually made of aluminum or copper foils, the collectors are attached to binders that do not reach optimal capacity. However, a paper from Yuan Yue and Hong Liang states that when these collectors are damaged from discharge induced detachment of the cast layer, structural integrity compromisation occurs. This damage is usually the product of extended cycles of charging and can be detrimental to the lifespan of a cell.
Whether that has anything to do with what Tesla will unveil at its Battery Day event is unknown. However, speculating of what could occur is a good thing, because it allows members of the community to work together to try and decipher what could happen.
In the meantime, all attempts to unravel Tesla’s plan have been foiled by Musk, indicating that nobody really has any idea what the company has in store for the future of electric vehicles and energy storage systems.
Tesla has added the 15th automaker to the growing list of companies whose EVs can utilize the Supercharger Network this year, as BMW is the latest company to gain access to the largest charging infrastructure in the world.
BMW became the 15th company in 2025 to gain Tesla Supercharger access, after the company confirmed to its EV owners that they could use any of the more than 25,000 Supercharging stalls in North America.
Welcome @BMW owners.
Download the Tesla app to charge → https://t.co/vnu0NHA7Ab
— Tesla Charging (@TeslaCharging) December 10, 2025
Newer BMW all-electric cars, like the i4, i5, i7, and iX, are able to utilize Tesla’s V3 and V4 Superchargers. These are the exact model years, via the BMW Blog:
- i4: 2022-2026 model years
- i5: 2024-2025 model years
- 2026 i5 (eDrive40 and xDrive40) after software update in Spring 2026
- i7: 2023-2026 model years
- iX: 2022-2025 model years
- 2026 iX (all versions) after software update in Spring 2026
With the expansion of the companies that gained access in 2025 to the Tesla Supercharger Network, a vast majority of non-Tesla EVs are able to use the charging stalls to gain range in their cars.
So far in 2025, Tesla has enabled Supercharger access to:
- Audi
- BMW
- Genesis
- Honda
- Hyundai
- Jaguar Land Rover
- Kia
- Lucid
- Mercedes-Benz
- Nissan
- Polestar
- Subaru
- Toyota
- Volkswagen
- Volvo
Drivers with BMW EVs who wish to charge at Tesla Superchargers must use an NACS-to-CCS1 adapter. In Q2 2026, BMW plans to release its official adapter, but there are third-party options available in the meantime.
They will also have to use the Tesla App to enable Supercharging access to determine rates and availability. It is a relatively seamless process.
News
Tesla adds new feature that will be great for crowded parking situations
This is the most recent iteration of the app and was priming owners for the slowly-released Holiday Update.
Tesla has added a new feature that will be great for crowded parking lots, congested parking garages, or other confusing times when you cannot seem to pinpoint where your car went.
Tesla has added a new Vehicle Locator feature to the Tesla App with App Update v4.51.5.
This is the most recent iteration of the app and was priming owners for the slowly-released Holiday Update.
While there are several new features, which we will reveal later in this article, perhaps one of the coolest is that of the Vehicle Locator, which will now point you in the direction of your car using a directional arrow on the home screen. This is similar to what Apple uses to find devices:
Interesting. The location arrow in the Tesla app now points to your car when you’re nearby. pic.twitter.com/b0yjmwwzxN
— Whole Mars Catalog (@wholemars) December 7, 2025
In real time, the arrow gives an accurate depiction of which direction you should walk in to find your car. This seems extremely helpful in large parking lots or unfamiliar shopping centers.
Getting to your car after a sporting event is an event all in itself; this feature will undoubtedly help with it:
The nice little touch that Tesla have put in the app – continuous tracking of your vehicle location relative to you.
There’s people reporting dizziness testing this.
To those I say… try spinning your phone instead. 😉 pic.twitter.com/BAYmJ3mzzD
— Some UK Tesla Guy (UnSupervised…) (@SomeUKTeslaGuy) December 8, 2025
Tesla’s previous app versions revealed the address at which you could locate your car, which was great if you parked on the street in a city setting. It was also possible to use the map within the app to locate your car.
However, this new feature gives a more definitive location for your car and helps with the navigation to it, instead of potentially walking randomly.
It also reveals the distance you are from your car, which is a big plus.
Along with this new addition, Tesla added Photobooth features, Dog Mode Live Activity, Custom Wraps and Tints for Colorizer, and Dashcam Clip details.
🚨 Tesla App v4.51.5 looks to be preparing for the Holiday Update pic.twitter.com/ztts8poV82
— TESLARATI (@Teslarati) December 8, 2025
All in all, this App update was pretty robust.
Tesla CEO Elon Musk shaded Waymo in a post on X on Wednesday, stating the company “never really had a chance” and that it “will be obvious in hindsight.”
Tesla and Waymo are the two primary contributors to the self-driving efforts in the United States, with both operating driverless ride-hailing services in the country. Tesla does have a Safety Monitor present in its vehicles in Austin, Texas, and someone in the driver’s seat in its Bay Area operation.
Musk says the Austin operation will be completely void of any Safety Monitors by the end of the year.
🚨 Tesla vs. Waymo Geofence in Austin https://t.co/A6ffPtp5xv pic.twitter.com/mrnL0YNSn4
— TESLARATI (@Teslarati) December 10, 2025
With the two companies being the main members of the driverless movement in the U.S., there is certainly a rivalry. The two have sparred back and forth with their geofences, or service areas, in both Austin and the Bay Area.
While that is a metric for comparison now, ultimately, it will not matter in the coming years, as the two companies will likely operate in a similar fashion.
Waymo has geared its business toward larger cities, and Tesla has said that its self-driving efforts will expand to every single one of its vehicles in any location globally. This is where the true difference between the two lies, along with the fact that Tesla uses its own vehicles, while Waymo has several models in its lineup from different manufacturers.
The two also have different ideas on how to solve self-driving, as Tesla uses a vision-only approach. Waymo relies on several things, including LiDAR, which Musk once called “a fool’s errand.”
This is where Tesla sets itself apart from the competition, and Musk highlighted the company’s position against Waymo.
Jeff Dean, the Chief Scientist for Google DeepMind, said on X:
“I don’t think Tesla has anywhere near the volume of rider-only autonomous miles that Waymo has (96M for Waymo, as of today). The safety data is quite compelling for Waymo, as well.”
Musk replied:
“Waymo never really had a chance against Tesla. This will be obvious in hindsight.”
Waymo never really had a chance against Tesla. This will be obvious in hindsight.
— Elon Musk (@elonmusk) December 10, 2025
Tesla stands to have a much larger fleet of vehicles in the coming years if it chooses to activate Robotaxi services with all passenger vehicles. A simple Over-the-Air update will activate this capability, while Waymo would likely be confined to the vehicles it commissions as Robotaxis.
Tesla adds 15th automaker to Supercharger access in 2025
Tesla adds new feature that will be great for crowded parking situations
