Samsung SDI, who already produces some of Tesla’s 4680 battery cells, has recently begun testing new solid-state batteries.
Solid-state batteries are expected to be smaller, lighter, cooler, and safer than current cell formats that are used in electric vehicles. There’s a lot of potential and possibilities in solid-state batteries.
Let’s dig into exactly what these new batteries are, and why everyone seems to fuss all over them on the big news channels every time a company makes an announcement.
Regular Batteries
The biggest thing to understand about solid state battery is how they’re different from regular batteries is terms of materials and design. We’ll dig into regular batteries first, and then get to solid state batteries.
Today, Tesla’s EVs – and EVs in general, use one of two types of batteries – LFP or NMC. LFP batteries are composed of Lithium Iron Phosphate (LiFP on the periodic table), while NMC is composed of Nickle Manganese Cobalt (NiMnCo). Tesla uses LFP batteries in its standard range vehicles, while their longer-range or performance siblings use NMC battery composition.
The biggest difference here is price and performance – LFP has a more stable chemistry and less degradation but also has a lower energy density. Meanwhile NMC performs better, outputs more energy, has a higher energy density, but isn’t as chemically stable and will degrade faster.
These chemical differences also aid with temperatures – NMC batteries perform better in more extreme weather conditions such as extreme cold or extreme heat – much better than their LFP siblings.
Both of these types of batteries also contain a liquid electrolyte – a wet medium that is electrically conductive and enables the movement of the ions in the battery pack, but won’t conduct electricity. So, with all that aside, let’s take a look at what solid state batteries bring to the table.
Solid State Batteries
Solid State Batteries don’t contain that liquid electrolyte. That’s already a huge change – because a large portion of the weight and density increases in regular battery packs actually originate from that heavy liquid. The replacement of that liquid is a stable, solid electrolyte, generally in the form of glass or ceramics.
Essentially, that frees up space and makes it easier to cool the batteries – so much so that solid state batteries today are used in smartwatches and other wearable devices – even pacemakers. In fact, that space saving is so large, that a solid-state equivalent of an LFP or NMC battery would use up 1/10th of the space, with a similar reduction in weight.
Additionally, solid state batteries don’t need all the additional equipment for monitoring, controlling, and cooling the liquid electrolyte – the pack is a solid block that can be cooled similar to a PC part – like a CPU.
The removal of the liquid electrolyte can also improve vehicle safety. We’re sure you’ve been told never to puncture a battery pack – that’s because when the electrolyte is removed, LFP and NMC batteries can experience thermal runaway – they have no way to cool themselves, and this heat reaction spreads throughout the battery, leading to a fire. In addition, the electrolyte tends to be flammable and toxic – making battery fires a truly dangerous, but still rare, phenomenon.
The electrolyte liquid – even though it does the important job of moving the ions around – actually can and will do permanent damage to the components of the battery, causing corrosion or build up over exceptionally long times. That’s exactly how you get battery degradation!
A solid electrolyte solves all these problems. Mostly. Even the solid electrolyte can degrade over time but will last an exceptionally long time. That’s why many companies advertise 20-year lifespans, and with considerable energy density.
Samsung’s recent solid-state breakthrough has them mentioning a 20-year lifespan with 500Wh/kg. Tesla’s newest 4680 cell is 244 to 296Wh/kg right now. Samsung has also mentioned a massive charging speed improvement – 9 minutes. That’s probably a 20% to 80% number, rather than a 0% to 100% number – as charge speeds at the far end of the curve tend to slow down considerably to protect the battery, while exceptionally low states of charge are uncommon.
Where is the Solid State?
We did say we already use solid state batteries elsewhere, like in wearable devices. But why not cars? They’re expensive. In fact, very, very expensive to manufacture at the size and scale needed to power EVs. Tesla and its battery suppliers, including Samsung, CATL, and LG, have been prototyping and working on their own solid state battery projects over the years.
Once they figure out how to scale these up, we could see drastic improvements in vehicle range and longevity, alongside improved charging times. But I wouldn’t expect them to show up right around the corner – it may take several years for engineers and scientists to work everything out, and another few to figure out to mass produce it.
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Over the years, Tesla has introduced UI elements that indicate when specific hardware or software features are active—and these two new dots follow the same pattern.
In June 2024, Tesla introduced the ability to see which third-party apps have access to the vehicle’s location, and these new indicator dots have a similar goal — to improve transparency on features that impact privacy.
Green Dot
If you’ve noticed a green dot on your Tesla display or the instrument cluster for the Model S or Model X, then you have access to Tesla’s hands-free Autopilot feature.
The green dot is displayed on the screen whenever FSD or Autopilot is active and the vehicle is using the interior camera to monitor the driver’s attention.
The cabin camera does a much better job monitoring the driver than the old method of sensing torque on the steering wheel. The cabin camera detects driver attention by tracking the driver’s head and eyes and making sure they’re focusing on the road. If the driver looks away from the road for an extended period, the vehicle will warn the driver or issue a strike for repeat offenses.
If the cabin camera is occluded or obscured, or if it’s simply too dark, the vehicle will fall back to monitoring the driver by detecting torque on the steering wheel.
The presence of the green dot not only lets the driver know that the interior camera is being used but also lets them know whether they need to keep their hands on the steering wheel.
It’s important to note that images and video taken with the interior camera are processed in the vehicle and do not leave the vehicle unless you have granted access for Tesla to use them to improve functionality.
You can check your privacy and data sharing policy in Controls > Software and tap the Data Sharing button at the bottom.
Orange Dot
The orange dot functions similarly to the green one, but instead of indicating cabin camera usage, it appears when the vehicle’s microphone is active. This was added with software update 2025.2, which now listens for audio cues to detect emergency vehicles and other types of noises that could help the vehicle better understand its environment in the future.
Tesla is currently collecting this data to refine its ability to detect emergency vehicles even before they come into view. This capability is expected to be added in FSD v14 along with a larger model size.
Like cabin camera analytics, drivers can opt to share audio data with Tesla to improve detection accuracy. Many users received an “Allow Sound Detection Analytics” prompt following the recent update. If they consent, Tesla may use certain audio snippets to help improve their detection model. Any data transmitted to Tesla is not linked to a specific user or vehicle, so it can’t be tied to a specific individual.
Otherwise, all audio detection and processing is completed in the vehicle to ensure the driver’s privacy.
Tesla proves once again that it listens to its customers, and this is a perfect example. Since the Cybertruck’s launch with an adjustable air suspension, owners have been requesting suspension-related features.
One major request is the ability to remotely adjust the vehicle’s height. This could previously only be done from inside the cabin via the touchscreen, but Tesla has now added it to the latest version of the Tesla app. However, using the feature also requires vehicle software 2025.8 or higher.
This software update also brings improvements to the Cybertruck’s steer-by-wire system, which is set to come to future Tesla models. Unlike traditional rack-and-pinion steering, steer-by-wire is not directly connected to the wheels like other vehicles, and “road feel” does not carry through to the steering wheel. Instead, Tesla implements software-driven wheel feedback, which is being improved in this update.
Remote Height Adjust
Now, as of Tesla software update 2025.8 and Tesla App V4.42.5, Cybertruck owners can remotely adjust the height of their Cybertruck through the Tesla app. This setting is in the Controls section of the app.
Here, you can adjust to the four pre-set road heights, including High, Medium, Low, and Entry. For now, you cannot adjust to the two Off-Road Mode heights, which are Very High and Extract.
Now, if you don’t own a Cybertruck, you’re probably wondering why so many are asking for this feature. Well, if you want to go off-roading or even want to load something into the bed of your truck, it’s convenient to be able to remotely adjust the height of the car without having to go in it first.
You can also use it to show off the Cybertruck’s massive vertical range of motion - which can go nearly eight inches from Entry to Extract - all without having to hop into the Cybertruck.
Model S and Model X?
This feature could also potentially make its way to the Model S and Model X sometime in the future since both of these vehicles also have an adjustable air suspension. Today, the heights of these vehicles can only be adjusted inside the vehicle.
We’re sure some Model S and Model X owners would love to be able to adjust the suspension remotely, even if they may not have the same use cases — it’s still a nice to have feature.
Steer-by-Wire Improvements
Tesla has improved the Steer-by-Wire feedback and response on the Cybertruck’s yoke. This new update should provide more realistic wheel feedback. The feedback will now adapt to different road surfaces for a better driving experience.
That means the response and feedback of the wheel will now be more precise - and also be varied by what kind of terrain you’re driving on.
More Features
One more thing we’d love to see from Tesla regarding the Cybertruck is the ability to drop just one side of the suspension. This is possible in Service Mode, where you can deflate either the front or rear air tanks, thereby inducing a slant to the vehicle.
This makes loading items even easier, as the bottom of the tailgate is now even closer to the ground. Tesla showed off the feature during the Cybertruck’s initial reveal. While the Cybertruck never arrived with its built-in ramp, we’d still love the ability to dip the truck for easier loading.
Another feature that was supposed to arrive for the Cybertruck was related to Steer-by-Wire. Today, the Cybertruck can steer up to 7 degrees, but the actual hard limit for the rear wheels is somewhere between 10 and 14 degrees. We’d love to see Tesla expand the rear wheel steering limits which will help reduce the Cybertruck’s already tight turning circle.
Four-Wheel Steering gives Cybertruck a tighter turning radius than a Model S
At low speeds, rear wheels rotate opposite to the front wheels—enabling tighter maneuvering around the jobsite, parking lots, etc pic.twitter.com/nxDiRTZKEI
