The remaining battery charge is indicated by the arrow

[Peter]

Hello,
Check this thread:

Is there any way to edit in more sophisticated way a watch face designed in Watch Face Studio?

It is built into Watch Face Studio Click Add Component Ranged Text in the right hand column for that Complication Settings → Default Provider Watch Battery In Beta 1.0 you see it in the Run Window, the video Tutorial shows it working correctly in the build window too so I assume it is coming there in a new version The Video goes pretty fast but it shows a lot of useful information if you step through it. Ron Samsung Developer Relations

Then you replace the battery hand image by arrow image