Weather extremes can indeed test LED lights' mettle. A light's runtime in perfect conditions might plummet in harsh weather. It's crucial to consider these factors when evaluating a light's worth. As for flashy modes, they can add a dash of style but may also drain batteries faster. It's all about finding the right balance between form and function. So, are weather extremes the real battery killers, or is our love for flashy modes the real culprit?