When I first got this product, I really liked it, it was great for keeping my phone charged while on a long flight or out sightseeing for a full day. A full charge of the portable battery could charge my iPhone 6 several times and I never worried about being out of battery. But unfortunately the inbuilt cable on the portable battery has stopped working after just 5 months of use - I connect it to my phone and get no charge. I know it's the portable battery because my regular phone charger works fine. Very disappointing since I'm about to go on another trip and was relying on this battery to work. Will be returning it asap.