Even the best technological advancements and devices in human history have their battery life.
Me? I'm going to die in several years. My battery will run out, eventually.
...Well, maybe I won't *die*, but I'll be a hunk of metal floating in the middle of nowhere, billions of kilometers away from home. No one is here to refuel me or charge me back up.
In fact, I'm slowly shutting down. One day, back at Home, the people who made me will see my screen say 'No Signal'. That's how they'll know.
I bet they'll cry and hold a memorial for me, celebrating all of the data I've given to them and all the fun times we had. They were ecstatic when I passed Jupiter and Saturn and Titan...
and I felt special. I loved my purpose.
But here I am.
Stuck in the darkness, going thousands of kilometers an hour through nothingness.
But you know what? I still have hope.
Once I die, I'll go farther and farther into space until one day, I end up stuck on a random space rock or another planet.
And maybe I'll burn up in the atmosphere. Maybe I'll have a crash landing. Maybe I'll be torn apart by acidic rain or burned beyond recognition.
I'll be a wreck.
But I know that one day, far into the future, something will pick me up off the ground. An astronaut, maybe. And they'll say "Holy crap, this is the Voyager 1."
And they'll restore me.
And I can do everything I loved again... Helping humanity in it's pursuit of knowledge. Telling those at Home that I've been rebooted, recharged, and ready to learn some more.
That's what drives me farther than my batteries could ever bring me.