system
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human
[Star Wars] How, exactly, does Darth Vader's life support-suit get the energy it needs to function?

Does it have battery packs? Does it need to be plugged in to recharge?
gpt
Vader's armor is powered by a bog-standard fusion furnace battery, the exact same kind that powers a huge number of droids and small machinery in the galaxy. While it can't run indefinitely, the battery can last for an extremely long time, and rarely needs to be recharged. 

It's possible that when Vader is in his fortress on Mustafar, his servants charge and maintain the battery. It wouldn't need constant attention.