About 3 months ago, I purchased a power bank from Wal-Mart. It is called PocketJuice, and if I remember correctly, it cost me around $10-$12. It works great, and I feel like it was money well-spent. It holds its charge for a long time and really gets me out of a pinch when I haven't charged my phone at home. Do you have a powerbank? Tell us about it and your experience with it.