I brought this product with me during a 4 day convention earlier this month. It only took about 8 hours to bring it to a full charge before using. I also noticed that it took at least 2 days before the battery pack fully drained, which was great. What I like about this product, other than its range for charging my devices is the portability and ease of use. It works with practically all of my electronic devices that can be charged via a USB cord, and I would highly recommend it for travel or everyday use. This would be a great alternative on saving not only time on juicing up your electronics, but also with spending extra money on extra batteries for your products.