Tesla Battery Issues Explained: What Model 3 and Model Y Owners Need to Know About Battery Performance and Replacement

Tesla vehicles are widely known for their advanced battery technology, long driving range, and cutting-edge performance. However, as with any complex system, issues can and do arise—especially as more high-mileage vehicles enter the market. In this article, we take a closer look at a lesser-known Tesla battery performance issue affecting certain Tesla Model 3 and Model Y vehicles and explain what it means for owners who may be experiencing range or performance problems.

Recently, we examined a Tesla battery module pulled from a 2023 Tesla Model 3 / Model Y Long Range (75 kWh) battery pack. What made this module particularly interesting is that it is tied to a quiet performance recall—one that many Tesla owners may not even realize exists.

A Tesla Battery Recall You May Not Have Heard About

This recall is not classified as a safety recall. According to Tesla, the issue is considered performance-related, meaning it may cause reduced range or power output rather than an immediate safety risk. Tesla has stated that affected battery packs may contain faulty cells, and if a customer reports performance or range degradation, the battery may be replaced without extensive questioning—provided the vehicle has the correct part numbers.

What’s important to note is that this recall is not widely advertised. It is not prominently displayed online, and most owners will not be notified unless they experience an issue and actively report it. In other words, if you don’t complain, the process may never start.

What We Found Inside the Tesla Battery Module

Upon opening the module, several concerning patterns became visible. Most notably, there was discoloration around multiple battery cells, indicating abnormal heat or chemical exposure. In several locations, electrolyte residue was clearly visible.

The root cause appears to be a cell weld issue on the negative side of the battery can. During manufacturing, the insulation ring around the weld point was likely overheated. This damage allows electrolyte to leak from the cell, which then seeps into other areas of the module.

These cells are typically welded upright, but once installed in the module, they are flipped upside down. As a result, any leaked electrolyte can drip downward, pooling at the base of the battery pack. In some areas, electrolyte was visibly beading around terminals. In others, the outside of the cell looked clean—until it was removed and revealed severe corrosion around the welds.

Why This Matters for Tesla Performance

Tesla maintains that this issue does not present a safety concern. However, the presence of flammable electrolyte leaking inside a sealed battery pack raises important questions. While there is a small gap between the module and the battery tray, leaked electrolyte still introduces unnecessary risk and degradation over time.

Even more critical is the impact on performance. It does not take widespread failure to cause noticeable problems. A single failing cell can trigger range loss, reduced power, warning messages, or drivability issues. In the module we inspected, there were five to six visibly affected cells—already far beyond what would be considered acceptable by most manufacturing standards.

And this was one of the better modules we evaluated. Another module from the same pack showed significantly worse degradation.

Symptoms of a Failing Tesla Battery

If you own a Tesla Model 3 or Model Y, especially a Long Range variant, you should be alert for the following signs:

• Sudden or progressive loss of driving range
  
• Reduced acceleration or power output
  
• Battery or drivetrain warning messages
  
• Charging behavior that seems inconsistent or slower than normal
  
• Performance changes without clear explanation
  

These symptoms may indicate an underlying Tesla battery module issue, even if no warning lights are immediately present.

Tesla Battery Replacement Options: Why Owners Look Beyond Tesla

While Tesla does replace some affected batteries under this performance recall, many owners encounter delays, limited communication, or outright denial once their vehicle falls outside warranty guidelines. This has led a growing number of Tesla owners to seek independent Tesla battery replacement specialists.

That’s where Greentec Auto comes in.

Why Choose Greentec Auto for Tesla Battery Replacement?

Greentec Auto is the world’s largest EV and hybrid battery replacement company, with over 34 locations and more than a decade of hands-on experience. Unlike traditional dealerships, Greentec Auto specializes in diagnosing, repairing, and replacing Tesla battery packs at a fraction of dealership cost.

When you choose Greentec Auto for your Tesla battery replacement, you benefit from:

• Expert diagnostics focused on real-world battery failure modes
  
• Cost-effective replacement options, including remanufactured packs
  
• Nationwide coverage with fast turnaround times
  
• Solutions for out-of-warranty Tesla vehicles
  
• Proven experience with Model 3 and Model Y battery systems
  

If you are experiencing range loss, performance issues, or suspect your Tesla battery may be affected by known cell defects, getting a second opinion can save you thousands of dollars.

Final Thoughts

Tesla batteries are sophisticated, powerful systems—but they are not immune to manufacturing defects or long-term wear. Performance recalls that fly under the radar can leave owners frustrated and uninformed. Understanding what’s happening inside your battery is the first step toward protecting your vehicle and your investment.

If your Tesla isn’t performing the way it used to, don’t ignore it. Have it evaluated by professionals who work with Tesla batteries every day—and explore your replacement options with Greentec Auto.