A real-world test of BYD’s Megwatt Flash Charge technology showed the battery hitting 169.6°F during a charging session. That’s hot enough to roast a turkey, and well above China’s recommended safety ceiling of 149°F for lithium iron phosphate battery cells. The test, conducted by an automotive blogger who livestreamed the session (via ChinaEVHome), has raised concerns about whether the heat generated by ultra-fast charging degrades long-term battery health. Why the heat matters Under normal driving and charging conditions, EV battery cells typically operate between 68°F and 86°F, with most vehicles flagging overheating warnings above 140°F. Temperatures in the range recorded…