That depends on how you plan to use your satellite device. A spare battery is always something we recommend. It comes in handy on extended trips where you may not have access to a power source for recharging, or if you lose the one that comes with your device. Also, all satellite phone manufacturers offer compatible docking stations with an external antenna that can be stationed outdoors, enabling the satellite phone or device to be used inside a cabin, vehicle, boat or plane. You’ll find a selection of docking stations and related accessories for each model of phone on our website. You can also live chat or email us at customercare@bluecosmo.com if you’d like to discuss options.