Best portable charger out there!!!

The power juice 4000 mAh power bank is the best portable charger I have ever owned!! If my phone is at 1% it charges it all the way to 100% and still has enough juice left to charge me at least another 40-50% when it dies again. It's a bit bigger than other power banks but it's not overly bulky and is not heavy. I own 4-5 other portable chargers, some are other Power juice power banks, but the mAh is much lower and they are not nearly as effective. On the others I will get to 50-60% before the power bank died completely and I have to grab another one or wait several hours for the one I used to charge up again. I recommend this to anyone that uses their phone a ton and need to constantly have a charging system near by!!