If the batteries last all day then why the need. The batteries last longer than I will ever need them in any one day. You just want to believe the glass is half empty I see it as half full.
You start out in the morning with a full charge and at the end of the day you still have at least 30% of the battery life left. And that would be even if I was driving or traveling. And if I was driving across country I could charge them while I was driving that way I would not have to hear the road.