Recharging the phone is relatively easy thanks to 1A port, as well as the battery itself, which takes place on the USB port on your computer or directly to an outlet (advisor because faster, but taking not supplied). Note, compatible with any phone, provided of course to have the appropriate cable as the one provided is used only to charge the battery.
The price is reasonable and limited space. Good point, the battery comes already loaded (about half in my case). So I advise