I hate when I forget to charge my power bank and my phone is about dead. If it's a sunny day and I have my Secur Sun Power Bank 4000 i'm good to go. The solar powered battery pack keeps you going, even when off the grid. The Secur Power Bank can be powered I hate when I forget to charge my power bank and my phone is about dead. If it's a sunny day and I have my Secur Sun Power Bank 4000 i'm good to go. The solar powered battery pack keeps you going, even when off the grid. The Secur Power Bank can be powered