yep, great videos. highly recommend to watch, our Atto 3: 91.3% OBD2 reports this calculated SOH guessing from Ah. 89% BYD engineer reported from the BYD BMS diagnosis tools. I did some research, even thou I have a massive loss of battery health (11%) it should stabilize and slow down. LFP degradation mostly occurs the first few years and then stabilizes chemically. Gemini suggest this for an LFP battery in Thailand heat for my case: 100% SOH (Brand New) ──> 0 – 50,000 km: 0-10% Loss ───> SEI Formation & Active Lithium Consumption ──> 50,000 – 100,000 km: 3-4% Loss ───> Diffusion Barrier Engaged; Plateau Phase (Projected SOH: ~88%) ──> 100,000 – 200,000 km: 2-3% Loss ───> Steady-State Plateau (Linear Aging) (Projected Exit SOH: ~84.5%) At 200K the SOH should be around 80% after the so called "SEI Layer passivation barrier" The SEI Layer Passivation BarrierWhen a graphite anode is first exposed to liquid electrolyte during its early life, a violent, irreversible reduction reaction occurs. This forms the Solid Electrolyte Interphase (SEI) layer on the graphite surface. This layer is a double-edged sword: it permanently traps a massive volume of active lithium ions (Loss of Lithium Inventory / LLI), which causes the early 8% to 10% drop. However, once the SEI layer achieves a specific critical thickness and density, it becomes a highly effective physical insulator. It blocks electrons and solvent molecules from passing through, effectively shutting down the very reaction that created it. Then there the "Degradation Knee" In battery engineering, the ultimate failure point is called the degradation knee—the point where the flat plateau suddenly snaps, and degradation turns sharply downward into an uncontrollable linear plunge. This knee occurs when the internal resistance (Ri) rises so high that localized lithium plating begins, destroying the cell geometry. For modern LFP chemistry, this knee is safely pushed deep past the 2,000 to 3,000 full cycle mark (equivalent to 1,000,000+ km) or roughly 15 to 20 years of calendar life. Because your maximum retention target is strictly capped at 200,000 km, you are exiting the vehicle precisely at the sweet spot: right at the end of its long, stable plateau, and years before the chemistry faces any risk of hitting the degradation knee. Your batter
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