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Spec sheets lie: the numbers that predict uptime

Which figures survive contact with a real shift, and which do not.

8 min read·Published 16 Apr 2026·Sourced · 4 references

A spec sheet is written to describe a machine at its best, not on an average Tuesday.

The spec-sheet mirage

Battery life, payload and speed are measured under test conditions that rarely match a working floor — mixed terrain, interruptions, a shift that runs longer than the test did. None of the figures are false; they simply describe a different day.

Buyers who shortlist on spec-sheet numbers alone are comparing best-case figures against each other, which tells you which factory writes the most generous test protocol, not which machine will hold up.

“Ask what the number was measured against. That question tells you more than the number itself.”
Fleet manager, systems integrator · Europe

A smaller set of figures tends to predict real-world uptime better than the headline spec.

The numbers that actually predict uptime

Mean time between failures under working conditions, not laboratory ones, is the closer proxy — alongside the size and location of the parts and technician network behind the machine, which decides how long a fault stays a fault.

Factory audits from 2026 consistently found that machines with modest headline specs but a strong local service network outperformed faster machines with a thin one, on uptime measured over the working life rather than the demo.

WHAT TO TAKE AWAY

  • Ask what conditions a spec-sheet figure was measured under before comparing it.

  • Weight the parts and technician network as heavily as the headline spec.

  • Ask for a working reference site, not a demo, before you commit.

  • The figure that predicts uptime is the one measured on a real shift, not on a spec sheet.

A claim can be tested before signing, not just believed.

How to test a claim before you buy

Ask for the conditions the headline figure was measured under, and ask for a reference site running the same category of task — not a demo, a working deployment — willing to speak to it.

A factory confident in its numbers will support both requests without friction. Reluctance to share either is itself the more useful data point.

EDITORIAL RULE

Sourced or silent. Every figure on this page carries an attributed, dated source. Where we could not source a number, we left it out rather than estimate it.

SOURCES

  1. 01Factory audits2026
  2. 02Manufacturer service SLAs2026
  3. 03Operator interviewsMilan, London, Abu Dhabi · Q1 2026
  4. 04N.O.N. Humanoid vetting notes2026

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