The biggest number does not answer every question
An exoskeleton page may show power in watts, battery energy in watt-hours and range in kilometres. These look like three ways to say “more”, but describe different things. Before choosing a winner, identify the question each quantity answers.
Watts measure power, not duration
The watt is a unit of power. “Peak power” is not a promise of continuous output at that level. Comparing one system's peak value with another's continuous output without clarifying the conditions is misleading. The number does not describe the fit or how intuitive the controls will be either.
That is why our catalogue cards explicitly label peak power. It does not measure a person's strength, permitted load or guaranteed speed. Those require other parameters stated by the manufacturer, not arithmetic assumptions.
Watt-hours describe energy, not distance
Wh describes the energy in a battery. The FAA explains the calculation: multiply nominal voltage in volts by capacity in amp-hours. If capacity is given in milliamp-hours, convert it first. When handling a particular battery, use its label rather than trying to reconstruct its specification from advertising.
A purely mathematical example: a hypothetical 50 Wh at a constant 25 W would give two hours in an ideal calculation without losses. This is not a Hypershell runtime prediction. A real motor need not draw the same power continuously, and peak power is not average consumption.
Kilometres reflect a particular test
Range combines the battery, control settings and test conditions. Alongside the distance, look for assistance level, speed, terrain and battery count. Without those notes, two distances may only look comparable. Check the device generation too: do not apply new S-version specifications to an X Pro or X Ultra from another series.
For the four models here, the website gives manufacturer figures per battery with their conditions. These are not promises for your own journey. If a seller quotes a total with a spare battery, ask for the single-battery result too. That makes the comparison clearer.
A few good questions beat a table of records
Before choosing, write three lines: “What power is quoted, and is it peak?”, “How many Wh are in the installed battery?” and “Under what conditions was the range measured?” Add the weight of the complete kit and local package contents. An honest gap is better than a polished ranking that treats unlike quantities as one score.
Then move on to fitting and your own use case. Reading a specification carefully does not make the choice for you, but clears up common misunderstandings before the first step.