News
Why Tesla’s lead acid 12V battery needs to be lithium-ion based
It’s a prominent issue surrounding the electric vehicle market that the old-school lead acid battery just isn’t appropriate for new technology vehicles. Many users of electric vehicles, especially Tesla owners, have cited concerns with the poor performance of their 12V or low-voltage battery, oftentimes requiring annual replacement.
In contrast, a lead acid battery in a traditional internal combustion engine (ICE) vehicle generally has a 4 year life-cycle, but why?
RELATED: Tesla Model S 12V Lithium-Ion battery replacement (up to 70% lighter, 4x life)
First off, some of the most important factors to consider in longevity of a battery are “cycle-life”, environmental conditions, discharge/charge rates and calendar-life; cycle-life is how many times the battery can be drained and recharged in its life. Environmental conditions include temperature and humidity. Discharge/charge rates are the amperages going out of and into the battery respectively.
There are two major differences between the way an ICE vehicle uses its 12V battery and the way an EV uses its 12V battery:
“OFF” state discharge and cycling frequency
ICE Vehicle: generally has a very low 12V load while the vehicle is in the “off” state, often this load doesn’t exceed a few watts and doesn’t present a major challenge for the 12V battery to maintain.
Electric Vehicle: The 12V load while in the off-state is often much higher due to advanced computer systems that are running to maintain the high-voltage battery, keep vehicle “connected” (all EV have some remote access features), maintain charging and BMS (Battery Management System) communications, etc. In fact a Tesla Model S/X puts about 50 Watts of load on the 12V system when the vehicle is in the “off” state. 50 Watts equals about 4.5 Amps of discharge on the 12V battery, this drains the battery down relatively rapidly and requires the 12V battery be “recharged” by the high-voltage battery regularly, this usage pattern results in many cycles being placed on the battery.
“ON” state utilization and purpose
ICE Vehicle: The 12V battery is used to initiate the ICE (start the car) and is designed for putting out large amounts of current to accommodate this process. Once an ICE vehicle is in the “on” state, it relies on an alternator to power all of the 12V sub-systems and also maintain the voltage of the 12V battery.
Electric Vehicle: The 12V is subjected to (practically) no additional load while the vehicle is being turned “on”, and although most vehicles are designed with DC/DC converters (which act as alternators) it is often an engineering design choice to reduce load on the DC/DC converter by minimizing the frequency with which it is utilized. This also extends the driving range of the vehicle because none of the precious high-voltage battery capacity is being shunted to non-driving tasks. Due to this usage profile the 12V battery is subjected to relatively low discharge and recharge currents.
When you combine the high number of cycles and the low current requirements of the electric vehicle 12V battery system you arrive at a completely different battery need than that of an ICE vehicle. Lead Acid batteries are very good at high discharge and low cycle count life-styles, this is their bread and butter and this is where they last a long time and provide the most bang for the buck (cheap cost and decent product life-cycle), but they aren’t lasting in electric vehicles.
The electric vehicle 12V battery system is one that is best suited by a battery capable of tremendous cycle-life as the main design goal. The battery chemistry that suits this usage scenario best? Lithium! Lithium battery technology is specifically very good at being cycled many times and continuing to provide minimal capacity loss and degradation. This, along with reduced weight, is why these batteries are used for the high-voltage battery packs, cell-phones, laptops, medical equipment and cars where batteries are being cycled frequently and longevity is important.
Editor’s note: This post was submitted into our network by Tesla Model S owner Sean Scherer. Having suffered an unfortunate incident in his Model S that left him stranded because of a faulty 12V battery, Sherer began on a mission to create a lithium-ion based 12V battery solution that was not only more reliable than the traditional lead acid battery, but better suited for the demands of a Tesla Model S, Model X, and electric vehicles in general. He began BattMobile Batteries, who have made it their mission to improve adoption of electric vehicles by solving some of the small details that has been missed by EV manufacturers.
We’ve also included a video tutorial on how to replace the Model S 12V battery.
News
SpaceX opens up free Starlink service for those impacted by Hurricane Melissa
SpaceX is opening up its internet service, Starlink, to those impacted by Hurricane Melissa, as it made landfall in Jamaica and the Bahamas as a Category 5 storm.
Hurricane Melissa is expected to reach wind speeds of over 165 MPH over the next few days as it extends out into the Atlantic Ocean by Thursday and Friday.
Satellite imagery shows Hurricane #Melissa‘s growth from its formation on October 21 to a Category 5 hurricane through October 27, 2025. #HurricaneMelissa pic.twitter.com/goR3Hbgb9c
— The Weather Network (@weathernetwork) October 27, 2025
Citizens in Jamaica and the Bahamas have been preparing for the storm for the past week, getting necessary goods together and preparing for the massive storm to arrive. It finally did yesterday, and the first images and video of the storm are showing that it could destroy many parts of both countries.
Starlink is now being opened up for free until the end of November for those impacted by the storm in Jamaica and the Bahamas, SpaceX announced today:
For those impacted by Hurricane Melissa in Jamaica and the Bahamas, Starlink service is now free through the end of November to help with response and recovery efforts → https://t.co/fUko3xSviJ
— Starlink (@Starlink) October 28, 2025
It is a move similar to the one the company made last year as Hurricane Helene made its way through the United States, destroying homes and property across the East Coast. SpaceX offered free service for those impacted by the destruction caused by the storm.
The free Starlink service was available until the end of 2024.
Elon Musk’s companies have also made similar moves to help out those who are impacted by natural disasters. Tesla has offered Free Supercharging in the past, most notably during the California wildfires.
Tesla and SpaceX’s LA fire relief efforts: Cybertrucks, free Starlink and more
One major advantage of Starlink is that it is available for use in situations like this one, where power might be required to operate things like a modem and router.
Internet access is a crucial part of survival in these situations, especially as it can be the last leg some stand on to get in touch with emergency services or loved ones.
Elon Musk
Tesla board chair reiterates widely unmentioned point of Musk comp plan
Tesla Board Chair Robyn Denholm appeared on Bloomberg TV this morning to discuss the current status of CEO Elon Musk’s compensation plan, and used the opportunity to reiterate a widely unmentioned key point of the entire package.
Critics of the proposed pay package, which would pay Musk $1 trillion if he completes every tranche, routinely cite the sheer size of the payday.
Of course, many skeptics leave out the fact that he would only get that money if he were able to generate eight times the value the company currently has.
Tesla gains massive vote of confidence on compensation plan for Elon Musk
For Musk, it might have a little bit to do with money, but that is likely a very small percentage point of why the compensation package is being offered to him. He has reiterated that it is more about voting control and overall influence, especially as Tesla dives into robotics.
He said during the Q3 Earnings Call:
“My fundamental concern with regard to how much voting control I have at Tesla is if I go ahead and build this enormous robot army, can I just be ousted at some point in the future? That’s my biggest concern. That is really the only thing I’m trying to address with this. It’s called compensation, but it’s not like I’m going to go spend the money. It’s just, if we build this robot army, do I have at least a strong influence over that robot army, not current control, but a strong influence? That’s what it comes down to in a nutshell. I don’t feel comfortable wielding that robot army if I don’t have at least a strong influence.”
Tesla shares the idea that Musk is a crucial part of the company, and without him being awarded the voting control he feels he deserves, he could leave the company altogether.
The company is very obviously feeling the importance of the upcoming vote, as it has advertised and pushed heavily for the comp plan to be approved, mostly to retain Musk.
Tesla Board Chair Robyn Denholm said today to Bloomberg TV that it is crucial shareholders understand it is not about Musk’s potential wealth, but more about his influence on company decisions:
“So firstly, it is a performance package, so he gets nothing if he doesn’t perform against the pretty audacious milestones that are part of the performance criteria that’s been outlined by the board in the performance package. So, I think rather than compensation, it’s actually about the performance and the goals that we have for the company as we move forward. And so, for me, it really is about making sure that investors understand that they actually get paid if he hits the milestones before he will…Elon’s been very public, including on last week’s earnings call, about the fact that it’s around the voting influence that he could have in future shareholder meetings as opposed to the economic interests.”
Musk is not an incredibly flashy person. He does not have crazy cars or a massive house to go back to. He spends a lot of his time working and sometimes even sleeps at his office inside the factory.
He recently said he “only has what is needed” because “material possessions were making him weak.”
Material possessions were making me weak, so now I have only what is needed
— Elon Musk (@elonmusk) October 20, 2025
News
The truth about Tesla ‘Mad Max’ mode from an actual user
Some people might see “Mad Max” as an extension of their daily driving.
For me, I did not see it that way. I saw it as a useful tool for certain situations, but it was certainly not something I could compare to my personal driving style.
But that does not mean that it’s wrong.
There have been many headlines about Tesla’s new “Mad Max” mode, but many of those writing about the “dangerous” and “controversial” mode have probably never used it.
As a writer, I write about topics I do not have firsthand experience with, but the job requires me to take a fair stance and report what is known. The problem is the nature of driving and driving modes, specifically, is subjective.
Some people might see “Mad Max” as an extension of their daily driving.
For me, I did not see it that way. I saw it as a useful tool for certain situations, but it was certainly not something I could compare to my personal driving style.
But that does not mean that it’s wrong.
NHTSA Probes Tesla Over “Mad Max”
Last week, the NHTSA launched a bit of a probe into Mad Max mode, requesting additional information on the Speed Profile and reiterating that the driver of the car is still required to be in ultimate control.
It’s important to keep the latter portion of that sentence in mind for the true thesis of this piece.
Now, it is no surprise to me that Mad Max garnered attention from regulatory agencies, as it is definitely a more spirited driving profile than the others.
Is Mad Max That Big of a Deal?
Regulatory agencies are responsible for keeping people safe, and it is important to note that their control is somewhat necessary. However, this type of drive mode is optional, requires the driver’s attention, and should be used responsibly for safe travel.
Playing Devil’s Advocate, how is Mad Max any different than the performance modes that some sports cars have? Because they require the driver to operate fully, and they are not semi-autonomous like Tesla can offer with Mad Max in Full Self-Driving (Supervised), are they safer?
The argument here really comes down to whether FSD is being used responsibly and correctly; any accelerated drive mode becomes more of a risk if the vehicle operator is not paying attention. This applies to any car company or drive mode they choose to use on their cars.
My Personal Experience with Mad Max
I have used Mad Max probably ten times since it rolled out to Early Access Program (EAP) members a few weeks ago.
I’ll admit: it did a lot of things I would never do driving a car manually. It passed people on the right. It was the fastest vehicle on the interstate, at least until I crossed into Maryland. Then, it seemed to be just another car on the road.
🚨 Tesla “Mad Max” testing on FSD v14.1.2
It drives like a human being! Consistent lane changes, keeps up with quicker traffic, very refined
Well done Tesla Team pic.twitter.com/wzTucDhczA
— TESLARATI (@Teslarati) October 19, 2025
It drove quickly, and not so fast that I felt concerned for my safety, which I never feared for, but fast enough that, at certain points, I was concerned that a cop would pull me over. I never encountered that scenario, but I wouldn’t be surprised if it resulted in some tickets.
With that being said, I don’t particularly think I’d use Mad Max in more than a handful of applications: driving the Baltimore Beltway would be one instance, navigating traffic in Baltimore, Philadelphia, or Pittsburgh during heavy traffic, or cruising on I-95, where cars routinely are going 100 MPH, much faster than Mad Max would ever travel.
Is it too quick for me in residential settings? For me, yes. Is it faster than every human driving on those roads? Absolutely not. In my experience, it is quicker than some, slower than others, just like any other Speed Mode Tesla offers, even Sloth, which refuses to go over the posted speed limit.
I think it’s wrong to sit here and act as if Mad Max is some incredibly dangerous and life-threatening hazard. If a driver is uncomfortable with the maneuvers or speed, they do not have to use it. However, it is no different from how many other cars travel on the road; it is far from an anomaly.
Tesla FSD’s new Mad Max mode is getting rave reviews from users
With that being said, it will be interesting to see if the NHTSA does anything about Mad Max, whether it will require Tesla to “nerf” the Speed Profile, or remove it altogether. It’s also important to note that this is my personal experience with Mad Max, and what I’ve experienced might differ from others’.
I would love to hear your thoughts on how Mad Max has driven for you, or your impressions of it.
-
Elon Musk2 weeks agoSpaceX posts Starship booster feat that’s so nutty, it doesn’t even look real
-
Elon Musk1 week agoTesla Full Self-Driving gets an offer to be insured for ‘almost free’
-
News1 week agoElon Musk confirms Tesla FSD V14.2 will see widespread rollout
-
News2 weeks agoTesla is adding an interesting feature to its centerscreen in a coming update
-
News2 weeks agoTesla launches new interior option for Model Y
-
News2 weeks agoTesla widens rollout of new Full Self-Driving suite to more owners
-
Elon Musk2 weeks agoTesla CEO Elon Musk’s $1 trillion pay package hits first adversity from proxy firm
-
News1 week agoTesla might be doing away with a long-included feature with its vehicles

