After owning nine Teslas, Ryan Shaw (@RyanShawTech) has needed just one battery replacement. A cell fault, rather than wear, prompted the replacement.
Here's what to know
A cell imbalance means one group of battery cells is out of step with the others. Shaw described the problem in a YouTube video, explaining that his 2020 Model Y was affected.
The car warned him he should schedule service, though it said he could continue driving safely. The alert also flagged possible reductions in the maximum charge level and driving range.
"Tesla ended up replacing the whole battery pack under warranty, and it didn't cost me anything," Shaw said.
Supercharging remained available during a separate charging failure in Shaw's Cybertruck, but AC charging did not. That fault involved the truck's power conversion system.
The electronics surrounding battery cells and modules are less reliable than those components, Tesla's battery director told Munro Live, according to Shaw.
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More background
According to Tesla fleet data, Model 3 and Model Y batteries retain about 80% of their capacity after 200,000 miles.
Tesla estimates that an average U.S. driver would take about 15 years to reach that distance, Shaw noted. For a vehicle that started with 300 miles of range, 80% of capacity would mean 240 miles.
Some lithium is consumed as a protective layer develops inside battery cells, leaving less available for energy storage. According to the Model Y manual, estimated range may fall slightly during the first few months and then stabilize.
As Shaw recounted, Stanford and the SLAC National Accelerator Laboratory spent over two years testing 92 commercially available lithium-ion batteries and found that real-world use could deliver lifetimes roughly one-third beyond earlier research expectations.
What can be done?
Because Tesla uses battery chemistries with different charging recommendations, drivers should follow the charge limit displayed on their touchscreens. The Model Y manual also advises keeping the vehicle plugged in whenever it is not in use.
Shaw charges overnight during off-peak hours and fills the battery before road trips. For vehicles that recommend an 80% daily limit, the manual advises saving a full charge for long drives.
On new Teslas, the route to a battery health test is Controls, then Service, then Battery Health, according to Shaw.
Tesla recommends using the test only to investigate a battery concern. It may also recalibrate the displayed range estimate. The test requires an AC charger delivering at least 5 kilowatts and may need a full day to finish.
One commenter shared their experience with a 2022 Model 3 that had traveled 80,000 miles.
"When charged to 100%, the car shows 416 km (259 mi) of range," they wrote. "When I first got it, this was 426 km (264 mi). So after four years of mostly fast charging, I seem to have lost 2% of battery capacity."
Where can I learn more?
For other EV owners, battery health has raised questions about repair bills and long-term ownership.
• A used Tesla Model Y needed a second battery replacement, leaving its owner fearing a $16,000 bill.
• A Tesla Model 3 owner detailed battery loss and repairs after reaching 250,000 miles.
• In California, a Cybertruck owner reported zero battery loss after 5,000 miles and near-daily charging.
• A dealer said a battery health score of 79 could sink a 200,000-mile EV's $8,000 trade-in value.
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