On vacation I bought this external battery, since I have my cell phone used for navigation, but did not know if our car has a cigarette lighter within reach. Had he, so I used the battery on holiday to load my GoPro and the spare battery in between. The operation is easy and the capacity for my purposes sufficient. However, one must be aware of the form factor in the clear. This battery has approximately the shape and weight of a 3.5-inch hard disk (a bit smaller). So I transported the battery in your pocket, but always in the backpack.
