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Electric forklifts are widespread but mainly because they work indoors. We also have many electric "mules" to tow equipment around. Excavators actually sit in a small area for a long time, they could separate the power supply battery into a "trailer" like pod on it's own wheels. They could have multiple pods that go back to a charging station on their own to recharge without having to move the entire bulk of the machine. The pods could even call for a replacement and autonomously move to and from the charging station giving just a short stoppage on the machine.
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