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Q1.
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What is the purpose of this initiative?
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A1.
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The battery run time of notebook PCs is a critical issue, but PC manufacturers measurement methods differ considerably. In order to correct this disparity and more accurately compare battery run times, standards have been established for luminous intensity for displays as well as CPU load and hard disk drive load, as these factors have a significant effect on battery run time. Moreover, these standards are not OS-specific, so that comparisons can be made in operating systems other than Windows.
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Q2.
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What is the official name of the measurement method?
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A2.
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The official name of this measurement method is as follows:
JEITA Battery Run Time Measurement Method (Ver. 1.0)
(abbreviated as JEITA-BAT 1.0)
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Q3.
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When does this new measurement method come into effect?
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A3.
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We expect to publish this measurement method so that PC manufacturers can include it in their new product catalogs beginning August 1, 2001.
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Q4.
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Was JEITA's new measurement method determined by monitoring the actual conditions under which people use their computers?
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A4.
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Because the range of conditions under which computers are used is so diverse, actual usage conditions cannot be specified.
JEITA's measurement method was developed as a secure measurement method for any PC manufacturer as it standardizes the method by which battery run times are measured.
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Q5.
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If this method is not intended as an accurate reflection of real-world notebook PC usage, how are we to understand and apply this value?
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A5.
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You will be able to use this value as a guide when comparing the notebook PCs of different manufacturers.
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Q6.
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If Company A's battery is rated at 2.5 hours and Company B's is rated at 3 hours, can I be certain that Company B's battery will last longer?
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A6.
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Because user conditions vary, the battery run time may be shorter than indicated depending on usage. Specifically, Company B's battery run time may be less than indicated if the display luminous intensity, OS and applications are different.
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Q7.
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Will participating companies be prohibited from publishing the results of their own measurement methods in product catalogs in future?
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A7.
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This will vary with the policies of individual companies. Some may choose to publish the results of both their own measurement methods as well as JEITA's measurement method in parallel.
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Q8.
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Since actual measurement conditions vary from company to company, are they justified in to comparing these values side-by-side?
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A8.
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We think that no significant variations exist because, we have standardized the CPU load, hard disk drive load and LCD luminous intensity, the factors with the greatest impact on battery run time.
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Q9.
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How does JEITA's method compare with Ziff-Davis BatteryMarkTM, a commonly used benchmark?
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A9.
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Although they cannot be compared directly, it seems that no great difference exists between them.
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Q10.
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Although this measurement method is now in use, what will happen once technological progress makes this measurement method obsolete?
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A10.
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We intend to review this measurement method annually.
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