Whats the real impact of extreme temperatures on ebike battery charging, and can manufacturers guidelines be trusted, or are they just conservative estimates to avoid warranty claims? Some owners claim that charging their ebikes in temperatures above 40°C or below 0°C causes irreparable damage, while others report no issues with frequent charging in these conditions. Is there a sweet spot for charging temperatures that maximizes battery life without impeding performance, or does the current advice from manufacturers serve only to protect their own interests? If we assume that most users will ignore temperature guidelines anyway, what are the long-term consequences of charging ebike batteries at the extremes of the recommended temperature range? Should cyclists prioritize preserving battery health over convenience, or can we afford to be more relaxed about temperatures when it comes to charging our ebikes?