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Wearable exoskeletons support selected movements by transferring force between a mechanical frame and the wearer’s body. Passive models redirect or store the wearer’s own movement; powered models use motors or other actuators to add force. Sensors and controllers coordinate assistance on some powered devices, while battery runtime depends on the specific model and use. There is no single battery-life figure for the category.
What a wearable exoskeleton does
An exoskeleton is an external structure worn on the body to support or augment particular movements. It is not a general-purpose strength boost: its frame, straps and joints have to fit the wearer and align with the movement it is designed to assist. Devices vary by the body region and task they address, from supporting raised arms to assisting with bending or walking.
Industrial and medical exoskeletons are different contexts. Workplace devices may support back, shoulder, arm, tool-holding or leg tasks. The U.S. Food and Drug Administration (FDA) describes a powered lower-extremity exoskeleton as a prescription medical device placed over weakened or paralyzed legs to facilitate movement at one or more lower-limb joints. That medical classification does not describe or establish the status of workplace equipment. The FDA records a 510(k) decision for Parker Hannifin’s Indego on September 8, 2017: FDA Indego 510(k) record.
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Passive devices redirect or return energy
A passive exoskeleton uses unpowered mechanisms such as springs, dampers, elastic elements, cables or counterbalances. These can store energy from the wearer’s movement and return it to support posture or motion. A shoulder-assist device, for example, can route some of the weight of raised arms through the frame toward the hips; a back-assist design may use a spring or counterbalance to provide a restoring force while bending or lifting.
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Because the assistance comes from mechanical elements rather than a powered actuator, a passive device does not need a battery to provide that assistance. It still has to be suited to the task and fitted correctly; a passive mechanism does not make load or fit considerations disappear. NIOSH explains the passive and active distinction in its overview of exoskeleton types: NIOSH, Fundamentals of exoskeletons.
Powered devices add force through actuators
Powered exoskeletons use actuators to contribute force or torque at one or more joints. Actuators may be electric motors, pneumatic systems or hydraulics. The frame and its attachment to the wearer transmit that force; the device does not create independent strength separate from its fit and mechanical connection to the body. Powered designs therefore need both an energy source and a way to coordinate assistance with movement.
The FDA’s medical-device description is one specific powered example: it refers to controllers and/or sensors used to facilitate movement of weakened or paralyzed lower limbs. It should not be read as a universal description of every powered workplace model.
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What sensors and controllers do
Sensors measure movement or the state of a device; a controller uses available information to coordinate when and how an actuator assists. The details vary by model. For example, Ottobock says its IX BACK VOLTON uses intelligent sensors to detect body movement and adjust support where needed. The company’s description does not establish a standard sensor package for all exoskeletons, nor does it specify every sensor in that model: Ottobock’s IX BACK VOLTON announcement.
It would be misleading to assume all exoskeletons read muscle signals, use AI to predict intent or respond in the same way. A device’s sensing and control approach is model-specific; the broad purpose is to coordinate mechanical assistance with the movement being supported.
How long an exoskeleton battery lasts
Battery runtime is model- and context-specific. The available figures below are manufacturer claims, not results from a standardized head-to-head endurance test, and the stated settings are not directly comparable.
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| Device or type | Published runtime | Qualification |
|---|---|---|
| Ottobock IX BACK VOLTON | Up to 10 hours | Ottobock’s current workplace portfolio page, accessed in 2026, lists this figure but does not specify a standardized load or duty cycle in the cited passage. The page also lists the device at 5.7 kg including its battery. Ottobock workplace exoskeleton portfolio |
| Ottobock IX BACK VOLTON | Up to eight hours | Ottobock’s November 4, 2025, series-production announcement gives this figure for the Bosch AMPShare battery. This differs from the current portfolio page’s “up to 10 hours” claim. Ottobock’s IX BACK VOLTON announcement |
| Ekso Indego Therapy | Four hours of clinical use | Ekso Bionics’ product sheet describes a rechargeable lithium-ion battery and four hours of clinical use. A rehabilitation-use figure is not directly comparable to a work-shift runtime. Ekso Indego Therapy product sheet |
| Passive exoskeletons | No battery runtime for assistance | Passive mechanisms provide assistance without external power. |
The two Ottobock figures conflict for the same model: the 2025 announcement says up to eight hours, while the current portfolio page says up to 10 hours. Neither is an independent measurement, and the portfolio passage does not state a duty cycle. Check current model documentation for the precise configuration and conditions rather than treating either figure as a guaranteed shift length.
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NIOSH groups workplace systems into back assist, shoulder and arm assist, tool holding or support, and leg assist. Studies summarized by NIOSH report reduced muscle activity or discomfort for some tasks, but the result depends on the task, posture, device and fit. Assistance may shift loading from one body area to another rather than eliminate it.
- NIOSH’s 2020 occupational health equity overview reports 10–44% lower back muscle activity during handling tasks in laboratory studies of back-assist exoskeletons. It also reports 24% lower hip extensor muscle activity and 50% lower neck muscle activity in laboratory-based tasks. These are observations from particular studies, not expected outcomes for every user or workplace. NIOSH occupational health equity overview.
- NIOSH notes potential hazards as well as potential benefits. A powered unit that moves a joint beyond its normal range can cause muscle strain; a leaking corrosive battery can irritate or burn skin; and a sudden discharge of stored battery energy can cause thermal burns.
- In one example discussed by NIOSH, using a heavy tool with a vest-mounted stabilizing arm increased spinal load. The device and task combination matters: supporting a tool does not automatically reduce the total physical demand.
These findings support evaluating the actual task, user fit, range of motion and possible load shifts before choosing or deploying a device. Laboratory changes in muscle activity do not by themselves establish that exoskeletons reduce injuries across workplaces. NIOSH’s industrial overview discusses task matching and potential hazards: NIOSH, Exoskeletons in the workplace.
How to assess a particular exoskeleton
Start with the movement and body region that need assistance, not the broad label “exoskeleton.” For a specific model, check the following:
Quick Recap
- Intended task and setting: Confirm whether it is designed for clinical rehabilitation or a workplace task such as overhead work, bending, tool support or walking.
- Assistance mechanism: Determine whether it is passive or powered and, if powered, what type of actuator supplies force.
- Fit and movement: Check how the frame attaches, which joints it supports, and whether its range of motion suits the wearer and task.
- Sensing and control: Look for model-specific information on what is measured and how the device coordinates assistance; do not infer features from another product.
- Runtime conditions: Treat stated battery life as a manufacturer estimate unless test conditions are supplied. Verify the precise model documentation, battery configuration and operating conditions.
- Risks and load shifts: Consider whether assistance could move strain to another body area or introduce hazards through fit, motion or battery use.
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