I charged them for 2 days but it's hard to know if they're fully charged as the light stays red all the time. They lasted no more than 4 hours. The insole was oddly cut, didn't match the shape and contour of the inside of the boot. It's like someone took an insole out of a shoe that was 3 sizes too big and shaped differently and put it in the shoe. These are definitely NOT $40 shoes. Luckily Walmart is great for returns and I was able to send them back. I recommend you to keep shopping, these shoes are not worth it.
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