WEARABLE-COMPUTER EVALUATION NOTES
Yenra | https://yenra.com/wearable-computers-for-the-military/
Prepared September 10, 2026. A comparison worksheet for an authorized, harmless training task. Follow the applicable equipment, information, and technical-publication requirements.

DEFINE THE TASK
Reader/user and starting knowledge:
Task (for example, identify labeled parts on a training mock-up and find the matching approved reference illustration):
Current baseline method:
Information source, equipment version, and reference revision:
Success criteria and scoring method:

RECORD THE COMPLETE CONFIGURATION
Display/headset, processor, sensors, radio, batteries, cables, and accessories:
Software/content versions:
Full worn/carried mass, if measured, with units:
Lighting, noise, movement, gloves, other worn equipment:
Local content available offline:
Remote support and connectivity needed:
What data is collected, where stored, who can access it, and how it is managed:

ENERGY ESTIMATE
Nominal energy (Wh):
Assumed usable fraction, with reason:
Usable energy (Wh) = nominal Wh x usable fraction.
Assumed or measured average system power (W):
Simple estimated runtime (hours) = usable Wh / average W.
List devices included and excluded from the power measurement:
Temperature, battery age, workload, test end condition:
Observed runtime and difference from estimate:

FICTIONAL EXAMPLE
24 Wh nominal energy, an illustrative 25 percent reserve, 6 W average draw.
24 x 0.75 = 18 Wh usable; 18 / 6 = 3 hours.
At 9 W, 18 / 9 = 2 hours.
These are invented inputs. The reserve is not a policy requirement. The calculation is a first-order estimate, not a product rating; validate representative measured performance.

COMPARE THE RESULT WITH THE BASELINE
Information-lookup time:
Complete-task time:
Errors / help requests / discomfort:
What was easier or harder, and why:
Later unaided assessment, if the objective includes learning:
Remaining uncertainty and evidence needed:

SOURCE CONTEXT
The companion article cites the Army's April 2026 maintenance demonstration and NIST SP 800-124 Revision 2. The demonstration illustrates workflows; the NIST document provides general mobile-device lifecycle questions. Neither authorizes a particular device or supplies the fictional example's power values.
https://www.army.mil/article/292095/augmented_reality_transforms_army_maintenance_and_training
https://csrc.nist.gov/pubs/sp/800/124/r2/final