Connect with us

News

Why Tesla’s lead acid 12V battery needs to be lithium-ion based

Published

on

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:

Advertisement

“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.

Advertisement

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.

Advertisement

News

Neuralink Blindsight human trials expected to start in the UAE

Neuralink aims to restore vision with its Blindsight BCI implant. First human implant for Blindsight may happen in UAE.

Published

on

Neuralink-clinical-trial-recruit-patient-prime-study
(Credit: Neuralink)

During Elon Musk’s interview at the Qatar Economic Forum, he announced that Neuralink aims to implant its Blindsight brain-to-computer interface (BCI) device in a human patient by late 2025 or early 2026.

Blindsight focuses on restoring vision. A few years ago, Musk mentioned that Neuralink’s BCI devices would restore vision for people, even those born blind.

“The first two applications we’re going to aim for in humans are restoring vision, and I think this is notable in that even if someone has never had vision ever, like they were born blind, we believe we can still restore vision. The visual part of the cortex is still there. Even if they’ve never seen before, we’re confident they could see,” Musk said during Neuralink’s Show & Tell in 2022. 

Musk said Blindsight could be implanted into a human patient in the United Arab Emirates (UAE). Neuralink plans to partner with the Cleveland Clinic Abu Dhabi to implant the first human patient with Blindsight.

Advertisement

Elon Musk’s neurotechnology company is partnering with the Cleveland Clinic Abu Dhabi to conduct the first clinical trial of the UAE-PRIME study. Like Neuralink’s PRIME study in the United States, UAE-PRIME will focus on human patients with motor and speech impairments.

Neuralink received Food and Drug Administration (FDA) approval to conduct the PRIME and CONVOY studies in the United States. PRIME tests the capabilities of the company’s Link implant to restore or enable motor and speech in participants. Meanwhile, the CONVOY study explores Link’s ability to control assistive robotic devices. Neuralink already has an assistive robotic arm called ARA that could expand patients’ autonomy beyond smart devices.

Blindsight would probably require a separate study from PRIME and CONVOY. As such, Neuralink might need FDA approval in the United States to start human trials for Blindsight. However, Blindsight already received a “breakthrough device” designation from the US FDA.

In April 2025, Neuralink opened its patient registry to participants worldwide. The neurotechnology company has already implanted its Link BCI device into five patients. Earlier this year, Neuralink welcomed one of its first PRIME study participants as the first patient in its CONVOY study.

Continue Reading

Elon Musk

Elon Musk just revealed more about Tesla’s June Robotaxi launch

Tesla CEO Elon Musk gave more information about the Robotaxi launch in Austin set for June.

Published

on

elon musk
Steve Jurvetson, CC BY 2.0 , via Wikimedia Commons

Tesla CEO Elon Musk just revealed more details about the company’s June Robotaxi launch, which will kick off in Austin.

As of right now, Tesla is still set to push out the first Robotaxi rides in Austin, Texas, in early June. These vehicles will be in short supply at first, as Musk says the company is purposely rolling out the fleet in a slow and controlled fashion to prioritize safety. There will be ten vehicles in the Robotaxi fleet to start.

Tesla Robotaxi deemed a total failure by media — even though it hasn’t been released

However, in an interview with CNBC on Tuesday afternoon, Musk also revealed some other new details, including where in Austin the vehicles will be able to go, how many Robotaxis we could see on public roads within a few months, and other information regarding Tesla’s Full Self-Driving suite.

A Controlled Rollout

Tesla has maintained for a few months now that the Robotaxi fleet will be comprised of between 10 and 20 Model Y vehicles in Austin.

The Cybercab, which was unveiled by the company last October, will not be available initially, as those cars will likely be produced in 2026.

Musk said during the CNBC interview that Tesla is doing a low-yield trial at first to initiate a safety-first mentality. It is important for Tesla to launch the Robotaxi fleet in a small manner to keep things in check, at least at first.

As confidence builds and the accuracy of the fleet is ensured, more vehicles will be added to the fleet.

Musk believes there will be 1,000 Robotaxis on the road “in a few months.”

Geofenced to Certain Austin Areas

Tesla will be launching the Robotaxi program in a geofenced fashion that gives the company the ability to control where it goes. Musk says that the areas the Robotaxis will be able to travel to are among the safest neighborhoods and areas in Austin.

This is yet another safety protocol that will ensure the initial riders are not put in dangerous neighborhoods.

Some might be disappointed to hear this because of Tesla’s spoken confidence regarding Robotaxi, but the initial rollout does need to be controlled for safety reasons. An accident or incident of any kind that would put riders’ lives in danger would be catastrophic.

No Driver, No Problem

As the company has rolled out an employee-only version of the Robotaxi program in Austin and the San Francisco Bay Area, some wondered whether the rides would be driverless, as these initial trials for Tesla workers were not. Employee rides featured a human in the driver’s seat to ensure safety.

Tesla says it has launched ride-hailing Robotaxi teaser to employees only

The company did not report whether there were any interventions or not, but it did state that the vehicles traveled over 15,000 miles through 1,500 trips.

Musk confirmed during the interview that there will be no driver in the vehicle when the Robotaxi program launches in June. This will be groundbreaking as it will be the first time that Tesla vehicles will operate on public roads without anyone in the driver’s seat.

Full Self-Driving Licensing

For more than a year, Tesla has indicated that it is in talks with another major automaker regarding the licensing of Full Self-Driving. Many speculated that the company was Ford, but neither it nor Tesla confirmed this.

Musk said today that Tesla has been in touch with “a number of automakers” that have inquired about licensing FSD. Tesla has yet to sign any deal to do so.

Continue Reading

Elon Musk

Elon Musk on Tesla vehicle sales: “We see no problem with demand”

“The sales numbers at this point are strong, and we see no problem with demand,” Musk said.

Published

on

(Credit: Tesla)

During a rather testy interview with Bloomberg’s Mishal Husain at the Qatar Economic Forum, Elon Musk stated that the demand for Tesla’s vehicles is still strong. Musk also stated that the issues that Tesla faced earlier his year have already turned around.

Already Turned Around

Tesla sales saw notable drops in the past months, particularly in Europe, where several countries saw drastically fewer Tesla sales year-over-year. Tesla stated in its Q1 2025 vehicle delivery report that the declines were largely due to the company’s changeover to the new Model Y, but media reports nevertheless placed the blame on Musk’s politics and his work with the Trump administration’s Department of Government Efficiency (DOGE).

It was then no surprise that Bloomberg’s Husain pointed out Tesla’s low sales in Europe this April during the interview. When questioned about the matter, Musk stated that things have “already turned around.” Musk also noted that while Tesla sales are down in Europe so far, this is true for numerous other carmakers in the region.

No Problem With Demand

When asked for evidence to back up his claims, Musk stated that Europe is indeed Tesla’s weakest market, but the company remains “strong everywhere else.” He also admitted that while Tesla has “lost some sales from the left,” the company also “gained some from the right.” Musk highlighted the fact that Tesla stock, which is partly affected by analysts with insider information, is trading at near all-time highs.

“The sales numbers at this point are strong, and we see no problem with demand. You can just look at the stock price. If you want the best insider information, the stock market analysts have that, and our stock wouldn’t be trading near all-time highs if things weren’t in good shape. They’re fine. Don’t worry about it,” Musk said. 

Advertisement

Watch Elon Musk’s full interview at the Qatar Economic Forum in the video below.

Continue Reading

Trending