According to the link above they say they use lithium batteries, probably better power/weight, but likely the whole device is potted in epoxy and there isn't an

According to the link above they say they use lithium batteries, probably better power/weight, but likely the whole device is potted in epoxy and there isn't any way to turn it on/off. It just runs from when the battery is welded/soldered until there isn't power left.