ThorFire & More via Amazon offers the Eachine X3 6,000mAh Portable Power Bank
in Black, Blue, or White for $16.65. Coupon code "T5LZFRZZ" drops it to $5.99
. Plus, Prime members bag free shipping
. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.44.) That's $11 off and the lowest total price we could find. Compatible with most smartphones, it features a built-in micro-USB cable, non-slip coating, and intelligent IC protection against over-charging, over-discharging, overloading, and short circuits.