For longer trips (plane / train) or outdoor trips as an ideal companion to smart phone or other electronics via USB to recharge.
A few apps (Super Nintendo Emulator) consume power more quickly than the external battery can supply, but still acts here the discharge counter.
The service is totally simple and foolproof. The LED indicator displays how far the "Power Bank" load / unload is.
Could my Samsung Galaxy S2 about 2.5 times completely recharge.
