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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsNeither brand’s batteries are universally better. A 2025 teardown study measured a tested Tesla 4680 NMC811 cell at higher energy density than the BYD Blade LFP cell it examined. That comparison supports a narrow cell-level finding—not a verdict on every BYD or Tesla battery, complete battery packs, vehicle range, safety, or durability.
What did the teardown actually compare?
Gorsch and co-authors’ peer-reviewed teardown analysis, published online March 6, 2025, examined two commercial lithium-ion cells: a prismatic BYD Blade cell using lithium iron phosphate (LFP) chemistry and a cylindrical Tesla 4680 cell using NMC811 chemistry. The results describe those tested samples, not every cell or vehicle either company sells. Read the study in Cell Reports Physical Science.
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Because both chemistry and cell format differ, the study does not show that cylindrical cells alone caused the Tesla cell’s higher measured energy density. Nor is it a comparison of complete battery packs or matched vehicles.
Which battery has higher energy density?
In the study’s cell-level measurements, the tested Tesla 4680 had higher energy density by both mass and volume:
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| Tested cell | Chemistry and format | Gravimetric energy density | Volumetric energy density |
|---|---|---|---|
| BYD Blade | LFP, prismatic | 160 Wh/kg | 355.26 Wh/l |
| Tesla 4680 | NMC811, cylindrical | 241.01 Wh/kg | 643.3 Wh/l |
These are measurements for the cells analyzed in the 2025 study, not pack-level specifications. A vehicle’s range also depends on factors such as pack architecture, usable state-of-charge window, cooling, vehicle efficiency, and total pack design. The study does not isolate battery contribution in a matched BYD-versus-Tesla vehicle comparison.
What trade-offs do LFP and NMC811 represent?
BYD Blade: LFP chemistry and prismatic packaging
BYD says the Blade Battery uses LFP chemistry, which the company characterizes as more stable, and notes that it contains no nickel or cobalt. BYD also says its long, blade-shaped cells improve packaging efficiency and use a honeycomb-like structure to increase battery strength. These are the manufacturer’s descriptions of its technology, not proof that every Blade pack is safer or more space-efficient in every vehicle. BYD’s Blade Battery overview.
Tesla 4680: NMC811 chemistry and cylindrical cells
The tested Tesla cell uses NMC811 chemistry and a cylindrical 4680 format. In this teardown, that particular cell delivered higher measured energy density than the tested Blade cell. A cell-level result alone does not establish that a Tesla pack or vehicle will have longer range, lower cost, or better performance than a comparable BYD product.
Are BYD Blade batteries safer than Tesla batteries?
The teardown does not establish a safety winner. Cell chemistry matters, but pack construction, thermal management, monitoring, isolation, and vehicle design also affect safety. BYD describes the Blade as stable and says it passes a nail-penetration test; Tesla describes a pack safety strategy involving cooling, thermal barriers, and cell isolation, with a design objective of limiting propagation after a cell event. These are manufacturer descriptions with different scopes and test bases, not a head-to-head independent safety test. Neither LFP chemistry nor any single test makes a battery “fireproof.” BYD’s description and Tesla’s battery engineering explainer.
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Does the teardown compare whole packs or current vehicles?
No. It analyzes cells, so its energy-density results should not be treated as complete-pack figures or direct vehicle-range comparisons. Pack-level results depend on how cells are arranged and integrated, how much capacity is usable, and the cooling and control systems. The sources do not establish a current, neutral, matched comparison of BYD and Tesla packs or vehicles for range, charging, longevity, cost, or safety.
How current is the 2025 comparison?
The teardown remains evidence about the two cells it examined, but company offerings have since evolved. On March 5, 2026, BYD announced Blade Battery 2.0, claiming 5% higher energy density and 2.5% lower overall capacity degradation versus the original Blade. Those figures are BYD’s claims, not measurements from the 2025 study or a direct comparison with Tesla. BYD’s Blade Battery 2.0 announcement.
Tesla’s September 2026 battery explainer says the company uses high-nickel cathodes in 4680 cells and LFP cathodes in standard-range vehicles that use non-4680 cells. Therefore, “Tesla battery” does not mean one chemistry or format across all models. Cell configurations can vary by model, factory, and date. Tesla’s battery engineering explainer.
BYD also describes FLASH Charging as capable of up to 1,500 kW in its Chinese-market specification. That is a charger capability claim, not a cell test or a global vehicle charging rate, and it does not establish a matched charging advantage over Tesla. BYD’s FLASH Charging information.
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