This spare battery I have been doing whenever I possibly between with extra energy for my smartphone or my MP3 player need.
Practical charge indicator and the USB adapter are simply indispensable in everyday life. The cylindrical and compact design make the MiPow in the smallest crevices in your backpack or bicycle bag disappear.
Only the blue paint dissolves by mechanical action (rubbing inside of the backpack with other objects) very quickly. But to be honest: I kommte it in the part anyway only on the intrinsic values !!!!
;-)
Strong buy recommendation!