These things can be unpowered, and there are multiple advances in this field already with clever combinations of springs, cables, webbing and mechanisms to augment the wearer's movements, help with load bearing by transferring loads to the ground around (instead of through) the wearer's spine and legs.
Not as much augmentation as a powered exo, but works all the time. And sure, they're no Talos, so limited, if any armour, but Talos only exists as feverred wish-dreams of certain Generals and their arms suppliers.
There are also advances in engine miniaturisation which can provide surprising amounts of power for their sizes. Multiple kilowatts. The thinking is batteries for stealth, internal combustion for combat or other high-energy use-cases e.g. search and rescue, moving equipment.
Biting the hand that feeds IT
