I need to create a task in TS based on battery level change. Let's say my battery drops from 67% to 66%. How can I run a task based on this event. Does Windows log this at all? I couldn't find this information anywhere.
I need to create a task in Task Scheduler based on battery level change
Windows doesn't log this kind of detail as events. You can however use something like the batch file below and create a custom event.
This batch file monitors the current battery percentage charge and creates a user defined event if the charge drops below a user defined threshold value.
@echo off setlocal EnableDelayedExpansion rem set threshold value set _threshold=82 :start rem get the battery charge rem use findstr to strip blank lines from wmic output for /f "usebackq skip=1 tokens=1" %%i in (`wmic Path Win32_Battery Get EstimatedChargeRemaining ^| findstr /r /v "^$"`) do ( set _charge=%%i echo !_charge! if !_charge! lss !_threshold! ( echo threshold reached rem create a custom event in the application event log rem requires administrator privileges eventcreate /l APPLICATION /t WARNING /ID 999 /D "Battery charge has dropped" goto :done ) else ( rem wait for 10 minutes then try again timeout /t 600 /nobreak goto :start ) ) :done endlocal
Eventcreatecommand works on Windows XP up to and including Windows 10, it requires administrator privileges to work
- If the battery falls below this value an event with ID
999will be generated in the APPLICATION event log with the description
Battery charge has dropped
- Modify the
eventcreatecommand as required for your situation.
- Modify the
timeoutdelay as required for your situation.
My battery currently has a charge of 81%. I set the threshold to
82. Here is what happens when I run
> battery 81 threshold reached SUCCESS: An event of type 'WARNING' was created in the 'APPLICATION' log with 'EventCreate' as the source.
And here is the new entry in the Event Log:
EVENTCREATE [/S system [/U username [/P [password]]]] /ID eventid [/L logname] [/SO srcname] /T type /D description Description: This command line tool enables an administrator to create a custom event ID and message in a specified event log. Parameter List: /S system Specifies the remote system to connect to. /U [domain\]user Specifies the user context under which the command should execute. /P [password] Specifies the password for the given user context. Prompts for input if omitted. /L logname Specifies the event log to create an event in. /T type Specifies the type of event to create. Valid types: SUCCESS, ERROR, WARNING, INFORMATION. /SO source Specifies the source to use for the event (if not specified, source will default to 'eventcreate'). A valid source can be any string and should represent the application or component that is generating the event. /ID id Specifies the event ID for the event. A valid custom message ID is in the range of 1 - 1000. /D description Specifies the description text for the new event. /? Displays this help message. Examples: EVENTCREATE /T ERROR /ID 1000 /L APPLICATION /D "My custom error event for the application log" EVENTCREATE /T ERROR /ID 999 /L APPLICATION /SO WinWord /D "Winword event 999 happened due to low diskspace" EVENTCREATE /S system /T ERROR /ID 100 /L APPLICATION /D "Custom job failed to install" EVENTCREATE /S system /U user /P password /ID 1 /T ERROR /L APPLICATION /D "User access failed due to invalid user credentials"
- An A-Z Index of the Windows CMD command line - An excellent reference for all things Windows cmd line related.
- eventcreate - Create a Custom Event in the Windows Event Viewer.
- schtasks - Create / edit a Scheduled Job/Task. The job can be created on the local or a remote computer.
- wmic - Windows Management Instrumentation Command.
There is a
Microsoft-Windows-Battery ETW provider with
BatteryPercentRemaining event with ID 13. You can code a project that uses TraceEvent to create a realtime listener for this
Microsoft-Windows-Battery provider. The event has the entries
RemainingPercentage to show the status and
PercentageChange to see the change:
When you see this event and see the
-1 change for
PercentageChange, run the program you want.
OK, the script provided by DavidPostill does not work. It's nice little script, but the code is either erratic or outdated.
Here is the fixed one:
@echo off setlocal EnableDelayedExpansion rem set threshold value set _threshold=30 :start rem get the battery charge rem use findstr to strip blank lines from wmic output for /f "usebackq skip=1 tokens=1" %%i in (`wmic Path Win32_Battery Get EstimatedChargeRemaining ^| findstr /r /v "^$"`) do ( set _charge=%%i echo !_charge! if !_charge! lss !_threshold! ( echo threshold reached rem create a custom event in the application event log rem requires administrator privileges eventcreate /l APPLICATION /t WARNING /ID 999 /D "Battery charge has dropped below the threshold." goto :done ) else ( rem wait for 1 minute then try again timeout /t 60 /nobreak goto :start ) ) :done endlocal
I suggested this edit into DavidPostill's answer, but I don't know why it wasn't approved...
There is a much easier way to check battery level. In navigation area just put mouse over the battery icon and it will give a percentage.