I love this particular battery pack. I'm constantly on my phone, especially when traveling. I use my phone for GPS, to take photos & to be connected to family and friends. So naturally, my phone battery dies pretty early on in the day. This battery pack usually charges my phone to 100% in about 45 minutes. It fully charges it for about 1-2 uses before I have to charge it again. It's a great accessory to have on you at all times.