I am a heavy cell phone user. I use it for all of my work calls, apps, payment, apps, emails ...everything. I don't leave the house without a spare battery pack for my phone, ever. However I still like to carry small purses....so it took awhile to find a Battery pack that has lasting power. This one charges my phone to full about 3.5 times....which is very very useful, however still compact and not too heavy. I would recommend this if you are a heavy phone user and never want to have your phone shut down. It's pretty good for $30.