We have both. My 46mm bluetooth only gets WAY more life it seems than my wife's 42mm bluetooth. She was dead in a day and it threw me off b/c I assumed she get a similar amount that I was able to achieve. It makes sense that smaller size would have less battery, but 25% capacity compared to mine? I usually get 4 days. Started at getting about 5 but adding things is a give and take.
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