I bought this to power LED Christmas lights for our golf cart. I charged it per the instructions. That was back in December. I had a total of two “Dripping light strings” strung together on the cart. I used this as the only power source since it has four USB Out Ports. We ran those lights a couple of times in a golf cart parade IN the park and once on a couple mile jaunt around the neighborhood too. Those used only 2% of the power! I’ve since used it to recharge my iPhone a few times, my iPad a couple more and most recently my Beats Fit ear buds case and my Garmin Golf watch a couple times. It’s NOW down to 87%!!! At this rate I won’t need to recharge it until next Christmas lol!