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Straight out of the box, the GoFlex Satellite had a significant battery charge. There are two LED lights on the box: both should be green most of the time to signify the power is on and a signal is ready. One of the lights will illuminate in blue when actually streaming content.
The battery life is fairly adequate with a maximum of five hours when continuously streaming HD video to one Wi-Fi-enabled gadget. That's enough for a cross-country or even a trans-Atlantic flight (depending on your starting and end points). That's also for HD video only, so if you're streaming music, looking at documents or photos, you can expect a lot more juice time.