A:AnswerA charging dock is very helpful as you can put it on the charger upright and you can just plug it in anywhere next to you and it's functions will work as it's charging. I will also recommend if you have a Samsung that you purchase a Samsung charger, I've experienced that they work better and faster than other name brand chargers. As for the External Battery pack charger, you would have to remove the battery from the phone and place it in the charger and plug it in the socket.
Hope this was helpful.
A:AnswerProbably. Just be careful of the size of any case you install on your phone. The construction is good and will probably work well with any phone with the micro USB plug on the bottom. I do not trust it to support my galaxy note 10.1 2014 edition which is much more awkward in landscape on the dock than a phone standing in portrait orientation would be.