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An inside look at Tesla’s P100D battery pack: more cells, 102 kWh capacity, backwards compatibility in mind

Published

9 years ago

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New details of Tesla’s mysterious P100D battery pack, which Tesla CTO JB Straubel once described as having notable changes in battery module and pack technology, and a “complete redo on the cooling architecture”, have emerged thanks to Jason Hughes’s latest project.

Hughes posted photos of a dismantled 100 kWh battery pack, which he obtained through the purchase of a salvaged Tesla P100D, that reveal an increase in the number of 18650 lithium-ion cells being packed within each battery module. Hughes also discovered a surprising increase in battery capacity beyond 100 kWh, and what appears to be a replaceable connector that allows Tesla to retrofit older vehicles with the newer battery pack.

More 18650 Battery Cells

As outlined in Hughes’s blog post, Tesla was able to fit more of its cylindrical 18650 lithium-ion battery cells into each of the 16 modules making up the P100D battery pack. It’s worth noting that Tesla has maintained a relatively similar form factor on battery packs produced for Model S and Model X vehicles since their introduction. Regardless of the vehicle’s model version – be it a P85, a 60, 75D, or 90D – the uniform skateboard design of the battery pack allows for ease of production, as Tesla can manufacture a single-style pack that can be installed across its fleet of vehicles. Under that same notion, Tesla has also been able to create ‘unlockable features’ by software limiting vehicle range depending on the option purchased by the customer. In other words, Tesla installs the same battery pack into like-kind vehicles (e.g. Model S 60 uses the same pack as Model S 75).

Tesla P85 battery pack module vs. P100D module [Credit: Jason Hughes via @wk057]

Hughes’s dissection of the P100D battery shows that Tesla leveraged the same design concept by distributing a total of 8,256 battery cells across the 16 modules making up the battery pack, bringing total capacity up to the advertised 100 kWh number. However, and much to Hughes’s surprise – he had previously criticized Tesla for providing less battery capacity than what’s perceived by way of the vehicle’s nameplate – Tesla actually provided 102.4 kWh of capacity on the P100D pack, representing a 2.4% increase over what’s marketed.

Backwards Compatible Design

Tesla has also, seemingly, taken into account the ability to retrofit new battery packs onto older vehicles by using the same high and low-voltage connectors across packs. According to Hughes, “the pack itself has the same high-voltage connection, the same low voltages connectors, and the same cooling connector.” However, Hughes notes that there’s subtle changes on the P100D pack that would require a new part in order for it to be retrofittable onto non-P100D vehicles.

“The [P100D] pack has the newer ring around the high-voltage connector. So, it’s plug-and-play (for the most part, firmware and config changes needed) on the Model X and refreshed Model S, however it would require a different spacer ring on the high voltage connector. Tesla even has a part number for it, so it should be pretty simple to put into any Model S/X.” says Hughes.

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What about that new P100D battery cooling architecture?

Well. It’s not magic. Tesla did improve battery cooling in the new P100D 100 kWh battery pack. And Tesla did provide a redone architecture, but it isn’t one of mythical proportions.

Hughes reveals Tesla’s approach to improve battery pack cooling was to use shorter and thinner cooling loops per battery module, thereby improving the rate of heat dissipation. Unlike most other electric car makers who do not “prime” their vehicle’s batteries through the use of a thermal management system, Tesla pumps fluid through the battery module to regulate the temperature of its battery pack in order to bring them to optimal operating temperatures. By ensuring the lithium-ion cells operate within ideal temperatures, Tesla is able to provide the best performance possible, while ensuring cell longevity.

Tesla P100D battery module cooling loops [Credit: Jason Hughes]

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Elon Musk

Tesla schedules Roadster unveiling event, and you won’t believe when it is

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3 hours ago

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November 6, 2025

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Tesla has tentatively scheduled its unveiling event for the Roadster’s next-generation iteration, and you will not believe the date the company picked for it.

Tesla CEO Elon Musk said during the 2025 Annual Shareholders Meeting that the company is aiming for an April 1 demo event.

Yes, April Fools’ Day.

Tesla originally aimed for its “most epic demo” to take place at the end of this year. However, the writing on the wall as 2025 winds down seemed to indicate the company was not quite ready to show off everything it plans to implement into the Roadster.

Its capabilities have been teased quite heavily throughout most of the year, but the biggest hints came last week when Musk appeared on the Joe Rogan Experience Podcast.

He said:

“Whether it’s good or bad, it will be unforgettable. My friend Peter Thiel once reflected that the future was supposed to have flying cars, but we don’t have flying cars. I think if Peter wants a flying car, he should be able to buy one…I think it has a shot at being the most memorable product unveil ever. [It will be unveiled] hopefully before the end of the year. You know, we need to make sure that it works. This is some crazy technology in this car. Let’s just put it this way: if you took all the James Bond cars and combined them, it’s crazier than that.”

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The Roadster has been somewhat of a letdown, at least in its newest version, thus far. Tesla has routinely delayed the project, putting those who put lofty down payments on the car in a weird limbo, lost at what to do.

One notable pre-orderer cancelled his reservation last week and got in a spat with Musk about it.

Now that there is a definitive date for the Roadster unveiling, Musk and Co. should have a more definitive cutoff date for features and capabilities. Chief Designer Franz von Holzhausen said earlier this year that when they showed Musk what they had done with the Roadster, the CEO encouraged them to do even more with it.

This delayed things further.

Musk also said he believes production would begin between 12 and 18 months after the unveiling, putting it out sometime in 2027.

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Elon Musk

Tesla (TSLA) shareholders officially approve Elon Musk’s 2025 performance award

To earn his landmark pay package, Musk would be required to lift Tesla’s market capitalization from about $1.1 trillion today to $8.5 trillion over the next decade.

Published

4 hours ago

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November 6, 2025

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Justin Pacheco, Public domain, via Wikimedia Commons

Tesla (NASDAQ:TSLA) CEO Elon Musk has officially approved his 2025 Performance Award, a landmark pay package that could make him the world’s first trillionaire and make Tesla the most valuable company in the world by a mile. 

The 2025 CEO Performance Award was officially approved by Tesla shareholders at the 2025 Annual Shareholder Meeting.

Elon Musk‘s landmark pay package

As per Tesla, more than 75% of the shareholders approved Elon Musk’s 2025 CEO Performance Award. It was then unsurprising that the approval of Elon Musk’s pay plan received overwhelming applause from the event’s attendees.

The CEO took to the stage with much enthusiasm, welcoming every shareholder to the event and dancing briefly on stage. Optimus also danced on stage smoothly, demonstrating its improved movements to much appause.

Elon Musk’s 10-year targets

To earn his 2025 CEO Performance Award, Musk would be required to grow Tesla’s market capitalization from about $1.1 trillion today to $8.5 trillion over the next decade. At that level, Tesla would surpass every major public company in existence. The compensation plan also requires Tesla’s operating profit to grow from $17 billion last year to $400 billion annually. 

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Apart from leading Tesla to become the world’s biggest company in history, Musk is also required to hit several product targets for the electric vehicle maker. These include the delivery of 20 million Tesla vehicles cumulatively, 10 million active FSD subscriptions, 1 million Tesla bots delivered, and 1 million Robotaxis in operation.

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Elon Musk

Tesla 2025 Annual Shareholder Meeting: How to watch

Published

6 hours ago

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November 6, 2025

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Credit: @YunTaTsai1 | X

The 2025 Tesla Annual Shareholder Meeting from Gigafactory Texas is set to kick off at 4 p.m. EDT, 3 p.m. CDT.

The company will be having its typical presentation for the event, where CEO Elon Musk, along with other executives will discuss things like future products, the outlook of its self-driving development, potential releases for next year, and some current events within the company.

However, this year’s Shareholder Meeting has slightly more implications than others, as Investors and Shareholders have spent the last several months petitioning and supporting one of the proposals on the docket that could be the deciding factor in Musk staying or leaving Tesla.

Elon Musk’s new pay plan ties trillionaire status to Tesla’s $8.5 trillion valuation

Proposal four outlines a new compensation package for Musk that could give him $1 trillion in shares if he is able to complete a variety of lofty goals related to production, self-driving, and other important company projects.

Musk has said that he is truly after more influence on company decisions, especially as the Tesla Optimus program is ramping up and becoming a more relevant part of the company’s story.

The CEO said during the Q3 Earnings Call that he would not feel comfortable developing an “army of robots” if he did not have a comfortable amount of influence in some of the decisions. He could be voted our or out-influenced by what he calls “activist shareholders.”

One of those investors came after his past pay package, which was approved by shareholders not once, but twice. Musk still was not able to obtain the pay because of a Delaware Chancery Court ruling.

Nevertheless, this is one of the last ditch efforts Tesla is making to get Musk the compensation that he wants.

The meeting is set to kick off at 3 p.m. local time in Austin. You can watch it via the livestream on X:

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