My mobile phone I use for GPS-based activities, the screen is permanently switched on. In this case, the device prevents _Entladung_ the phone battery, ie the charge is retained. As soon as the screen is turned off or is dark, the phone battery is even _geladen_.
The annotated by some 'Fummeligkeit' the switch, I can not understand. So far, the switch has moved inadvertently.
The Annotated 'weakness of locking' of the cover I can not understand well. The cover encloses the body of the device and can be pushed down. My unit has a tight fitting lid, there is not a manipulation of the body necessary.
The battery can be seen is very simple, on one side is a hole in the housing, can be pushed out by the battery. The other batteries should be removed then a slight.
Large drawback: The polarity of the battery is no longer seen in the dark. With a sticker that is quickly corrected. Taking the batteries incorrectly, it says on the package label: "Inserting batteries upside down will cause the pack to malfunction," I have not tried it.
The built-in flashlight feature is a nice added benefit.
