Measure the batten from the floor up to the desired height using a measuring tape. Mark the point with a pencil.
Hold a torpedo level at the measured reference point and draw a level horizontal line across the batten strip.
Cut across the surface of the batten with a utility knife following the horizontal line.
Pry the batten out from the vinyl wall seam using a putty knife. Put the putty knife between the batten and the vinyl. Pry only until the inner part of the batten is exposed.
Cut the inner part of the batten with the utility knife.
Push the remaining end of the batten into the seam.
Remove the unwanted batten by pulling it out from the seam slowly and evenly toward you.
Repeat the process to remove the remaining batten.