JEITA Battery Run Time Measurement
Method(Ver. 2.0)

Issued on January 20th, 2014
Japan Electronics and Information Technology Industries AssociationRevision History
Jun 20, 2001
JEITA battery run time measurement method (Ver. 1.0) was established.
Aug 1, 2001
Ver. 1.0 was executed.
Jan 20, 2014
JEITA battery run time measurement method was revised (Ver. 2.0).
Apr 1, 2014
Ver. 2.0 was executed.

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CONTENTS
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Preface ··························································································
Names ··························································································
Scope of Application ·········································································
Measurement Method ········································································
4.1 Overview
4.2 Measurement Conditions

1111Measurement and Run Time Calculation ··················································
5.1 Measurement Method a)
5.2 Measurement Method b)
5.3 Run Time Calculation
6 Display and Information Disclosure ·······················································
7 Use of Trademarks and Patent Rights ······················································
8 Validity ·························································································[Commentary] ······················································································

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1.

Preface“JEITA battery run time measurement method (Ver. 1.0)” (hereinafter “JEITA-BAT1.0”), which wasestablished in 2001 by Japan Electronics and Information Technology Industries Association (hereinafter“JEITA”), has been adopted by a number of notebook PC manufacturers up to date and it has played acertain role as a guideline for PC users to compare battery run times before purchasing notebook PCs.
Technological advances and use environment changes in the recent years, however, have changed theoperating status of devices such as improved CPU and image processing performance, diversified
functions and applications, and widespread use of wireless communication functionality. After its
establishment 13 years ago, the JEITA-BAT1.0 is now upgraded to Ver. 2.0 with revised measurement
conditions and other factors, based on the technological advances and environmental changes.
A review task group was set up within JEITA CE Section Personal Computer Operation Committee todiscuss such revisions. The revised items and their details were defined mainly based on the following
concepts:
The measurement method targets battery-mounted personal computers.

The measurement method is applied in the general operations that can be adopted to a variety ofdevices and compared between them, regardless of the device, OS type or version used.

Its measurement conditions take into consideration the greater functionality of recent mobiledevices and changes in their use environment.

Like JEITA-BAT1.0, Version 2.0 can serve as a common guideline to allow the user to compare
battery run times.

2.

Names
The official names and their abbreviations are as follows:
Official Japanese name: JEITA バッテリ動作時間測定法（Ver. 2.0）
Abbreviated Japanese name: JEITA 測定法 2.0
Official English name: JEITA battery run time measurement method Ver. 2.0
Abbreviated English name: JEITA-BAT2.0

3.

Scope of Application
It targets battery-mounted personal computers.

4.

Measurement Method
4.1

Overview
Calculate the average of the run times under Measurement Methods a) and b), according to theconditions shown in Section 4.2. Then define the result as the battery run time based on thismeasurement method.

1

4.2

Measurement Conditions
１） Sound volume: The lowest (mute is also permitted)
２）

Screen brightness: 150cd/m2 or more
If the product does not reach a maximum brightness of 150cd/m2, the maximum brightness ofthat product is used instead.
The brightness is defined when white is displayed on the screen.
White is achieved when all of R, G and B pixel data are set to the maximum values.

３）

Wireless LAN: It is the state in which the device is connected to an access point.
Communication system, the availability of communication, radio wave environment anddistance to the access point are not specified.
If the device does not have a wireless LAN function, this setting is not mandatory.

４） Other wireless communication functions (Bluetooth, 3G, etc.): Can be turned off.
５）

Video replay software: If video replay software is installed on the device, use that installedsoftware. Otherwise, use the software that can be downloaded or purchased by the user.

６） Display size of the replay screen: Full screen.
Although power management settings, the treatment of other applications and backgroundapplications during measurement and the battery power remaining during transition to shut-down orhibernation are not specified, the user must be able to set their conditions in easy convenient manners
such as OS, application and BIOS.
If the charging performance is restrained in the shipment state, the run time from fully-charged state
can be measured. Such a condition, however, must be disclosed.
Although the storage location of a video file is not specified in this measurement method, such alocation must also be disclosed.
5.

Measurement and Run Time Calculation
5.1

Measurement Method a)
Load the video file specified in this measurement method in continuous play and measure thetime from starting the battery operation to moving to shut-down or hibernation.
Condition: Apply all of the items in Section 4.2.

The specifications for the video to be played are as follows (the video file can be downloaded from theJEITA website http://home.jeita.or.jp/cgi-bin/page/detail.cgi?n=84&ca=14):

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5.2

Video size

：1920×1080 pixels

Video codec：H.264/AVC

Video bit rate：10Mbps

Frame rate

：29.97fps

Sound codec：AAC

Sound bit rate

：160kbps

Measurement Method b)
Leave the desktop screen displayed and measure the time from starting the battery operation to
moving to shut-down or hibernation.
Condition: Apply 1) to 4) in Section 4.2.

5.3

Run Time Calculation
The battery run time is calculated in the following formula using the run times achieved in
Measurement Methods a) and b):[Measurement Method a) + Measurement Method b)] / 2

6.

Display and Information Disclosure
・The battery run time must be displayed by indicating that it complies with JEITA-BAT2.0.

・The display unit is [hours] and any amount smaller than the first decimal place must bedisregarded.

・(approx.) can be added to values displayed (e.g. x.y hours (approx.)).
E.g.

Measurement Method a) = 3 hours 15 minutes
Measurement Method b) = 8 hours 7 minutes(195 minutes + 487 minutes ) / 2 ＝ 5.683 hours
Thus, it should be displayed as 5.6 hours (or 5.6hours (approx.)).

Sample Display

Battery run time (JEITA 2.0)*1 5.6 hours*1 Measured based on JEITA Battery Run Time Measurement Method (Ver. 2.0).
・7.

Items whose information should be disclosed (e.g. it can be disclosed on websites, in catalogs, etc.)
Method to set the screen brightness to about 150cd/m2 without using a brightness meter.

Video replay software used

Storage location of the video file

Details of setting changes from the shipment state to measurement state

Use of Trademarks and Patent Rights
The video file specified in this measurement method is protected under the copyright law and other3laws. It may be used only for the intended purpose of battery run time measurements. Before using the file,
make sure to read the precautions provided in its download page.
Bluetooth is a registered trademark of Bluetooth SIG. Inc.
Any other system names, product names and service names are generally trademarks or registeredtrademarks of their respective development manufacturers. Symbols such as (TM) and (R) are notprovided herein.
8.

Validity
JEITA-BAT2.0 shall be valid from April 1, 2014.
- End of Document -4

[Commentary]
1. The Gist of Establishment and Revision of JEITA-BAT
Before this measurement method was established in 2001, the battery run times ofnotebook PCs could not be compared with one another, because each manufacturer
had its own specified measurement standard.
For that reason, the establishment of a uniform measurement method was muchanticipated. In response, JEITA-BAT1.0 was created as such a measurement methodthat unified major measurement standards for “screen brightness”, “CPU load”,“HDD load” and other factors.
As the use of personal computers became widespread among the general public
and their functionality became more advanced with improved energy saving
capabilities, many people started commenting on gaps between the conditions of thismeasurement method and the conditions of the actual usage. Due to thecharacteristics of general-purpose devices, however, their diversified applications
made it difficult to identify each use situation. For that reason, Ver. 1.0 continued to
be used merely for the purpose of unifying the measurement standards.
As, however, wireless communications are now widespread among the generalpublic in addition to rapid advances in energy-saving technology and image
processing performance in the recent years, a number of people have voiced thenecessity of the measurement conditions that take into consideration suchtechnological advances and use environment changes. As a result, JEITA-BAT has
been updated to Ver. 2.0.
Through this revision, no change was made to the original purpose of unifying themeasurement standards at the time of its initial establishment and a main focus wasplaced on a review of the measurement conditions.
2. Comparison of Measurement Conditions between New and Old Versions
Below are the key changes in the measurement conditions from Ver. 1.0 to Ver. 2.0.
Item
Screen brightness

Ver. 2.0

Ver. 1.0

150cd/m2 or moreMeasurement(When R, G and B are set

Method a): 20

to maximum values)

cd/m2
Measurement
Method b):5NoteMinimumbrightness
Wireless LAN

State in which the device
is connected to an access－point
Other wirelessCan be turned off－

functions*1
Video replay software

Installed software

Display size of theFull screen

320×240 pixels

Completion ofShut-down orForced terminationmeasurement

hibernation (Forced

due to flat battery

termination due to flatis also permitted*1Bluetooth、3G,etc.

－replay screen

battery is also permitted,
if it can be set by theuser.)
Battery charging

Charged on the－methodmain unit

Storage location of theHard disk－

video file
Codec for the video file

H.264/AVC

MPEG1

3. Details of Measurement Conditions and Measurement Method
3.1 Measurement Conditions
1) As it is difficult to find a way to achieve a specific sound volume and any
fluctuations must be avoided, Ver. 2.0 specifies that the volume be set to “Thelowest (mute is also permitted)”, which was also the case in Ver. 1.0.
2) As for wireless LAN, real file transfer was initially considered. However,depending on the communication method used, the radio wave environment
during the measurement, the distance to the access point and other factors, thereal file transfer is highly likely to generate significant variations inmeasurement values. Therefore, it is concluded that connecting to an accesspoint is only the condition defined for wireless LAN in order to readdress theoriginal purpose of providing run times under a uniform measurement method.
3) Regarding other wireless functions (i.e. wireless settings other than wirelessLAN, such as Bluetooth and 3G), they “Can be turned off”, because some6

products may encounter problems such as their main functions failing tooperate when other wireless functions are turned off.
4) In principle, preinstalled replay software should be used. If, however, thespecified video cannot be played using the preinstalled software, it is allowed touse the one which can be downloaded or purchased by the user, just like when it
is not installed. If multiple video replay software applications are alreadyinstalled, you can use any of them during the measurement.
5) It is permitted to stop the background operation of the OS, stop or uninstallother applications in order to provide stable run times during the measurement.
In that case, however, details of any change from the factory settings must bedisclosed. As for power management settings and the treatment of applications,
their conditions must be able to be set by the user in easy convenient manners
and such conditions must be described clearly. The “easy convenient manners”
refer to the manners that enable the above settings to be made using anapplication provided by a manufacturer or on the control panel of the OS. It
excludes any special method (such as a debug program) that is not generally
used in the normal use environment.
6) While Ver. 1.0 restricted the storage location of the video to HDD only, Ver. 2.0
does not specify such a location but only requires the location to be disclosed,
taking into consideration advances in HDD energy-saving technology and theproliferation of SSD. The information to be disclosed can simply be a folder
name on the desktop or in the video library folder.
3.2 Measurement Method
In addition to the above-mentioned video replay, a method integrating otherapplications such as web browsing and email transmission/reception was also
considered initially. In conclusion, however, the existing measurement method has
been followed as a method that can be used for a long term without being affected byvarious OSs or OS versions. Its specifics are as follows:1) Initially, it was considered to define what percentage of remaining battery must
trigger the device to move to “shut-down or hibernation”. As, however, eachdevice has a different battery capacity, it is determined that such uniform
definition is meaningless. Therefore, it is concluded that no definition should bemade and only the information about relevant conditions should be disclosed
instead.

72) Regarding the frame rate of the video for measurement purposes, theapplication of “59.94fps” was initially considered. However, “29.97fps” is now
chosen, taking into consideration the possibility that there may be dropping
frames among models with low video processing performance.
3) The video for measurement purposes was created in cooperation with NHK
Engineering System, using eight types of videos selected from those issued as“ITE/ARIB Hi-Vision Test Sequence 2nd Edition” by The Institute of Image
Information and Television Engineers and the Association of Radio Industries
and Businesses.
4. Switchover from Ver. 1.0 to Ver. 2.0
It is desirable to use data measured with Ver. 2.0 for new products that will start
being sold on April 1, 2014 or later.
Although it is permitted to provide run times in both the new and oldmeasurement methods for about one year in order to avoid any confusion on themarket, it must be avoided to use any expression that would result in misleading
presentation so as to protect consumers, such as using the values measured with Ver.
1.0 alone or emphasizing them.
It is desirable to indicate which measurement method was used to calculate eachvalue so that the user can identify it clearly, taking the following into consideration:
 When Ver. 2.0 and Ver. 1.0 are displayed horizontally, Ver. 2.0 shall be placedon the left.
 When Ver. 2.0 and Ver. 1.0 are displayed together, the font size of Ver. 1.0 shallnot be larger than that of Ver. 2.0.
Sample Display Battery run time (JEITA 2.0*1/1.0*2)

5.6 hours/7.0 hours*1 Measured based on JEITA Battery Run Time Measurement Method (Ver. 2.0).
*2 Measured based on JEITA Battery Run Time Measurement Method (Ver. 1.0).
 When Ver. 2.0 and Ver. 1.0 are displayed vertically, Ver. 2.0 shall be placed ontop.
Sample Display Battery run time

JEITA 2.0*1

5.6 hours

JEITA 1.0*2

7.0 hours*1 Measured based on JEITA Battery Run Time Measurement Method (Ver. 2.0).
*2 Measured based on JEITA Battery Run Time Measurement Method (Ver. 1.0).
- End of Commentary -8