Comment by tommi

45 minutes can be a lot if you keep it in hand over night for sleep tracking. You'd then need a to find a 45 minute slot every day to charge it and be consistent with it. With one day battery life you can't forget to charge it every morning for example. Or what if you didn't bring a charger with you for an overnight trip? Anything less than a full two day battery life is a deal breaker for me.