RemixIconEx.Device.battery

You're seeing just the function battery, go back to RemixIconEx.Device module for more information.
Link to this function

battery(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Device.battery()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M4 7v10h14V7H4zM3 5h16a1 1 0 0 1 1 1v12a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V6a1 1 0 0 1 1-1zm18 4h2v6h-2V9z" />
</svg>

example usage

svg.icon {
  width: 96;
  height: 96;
}