Have you begun reading from here: WeatherFlow Tempest API & Developer Platform
My guess to the question you asked is yes but…
My guess is that your question may mean ‘Is it possible to use the API to retrieve the 3 second rapid wind values?’
The easiest way to begin experimenting to see what is returned from the API is to use a browser window from this page.
WeatherFlow Tempest API & Developer Platform
The latest observations are updated every minute. You can refresh your browser window to see what happens if you refresh every 3 seconds.
I guess your reference to draining the battery might be due to this comment: Wind data every 3 second - #2 by eric which is referring to the Tempest sending a 3 second rapid wind reading or less often IF the Tempest battery voltage is low.
There is a way to get your own 3 second rapid wind values.
For example this thread: Websockets Clarification - #5 by livysdad27
Some developers on this group have created software which displays and some store the 3 sec rapid wind values. You can see their creations here:
Third-Party Integrations - The Tempest Weather Community
I used to use this ArchiveSW software to display and store my 3 second rapid wind values but I have not tried using it with a Tempest:
ArchiveSW - Display & Data Archive Storage
cheers Ian 
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