I charged it out of the box and it fully charged in 30 minutes, I do not know how much charge was in the headphones from the factory. Will purchased another with the next barbell I get. I have been wearing them for a couple of weeks and they are already getting damaged. Recommended for sure! But they are incredibly bright. I am unsure that these boots could ever be improved on, they are perfect and highly recommended. They come with small medium and large silicone ear pieces and they are very comfortable. It?s frustrating. 5 that fit me perfectly and no problems with residue on the shoes. These are handy in different areas.