Show battery charging state in the config panels (#6356)

src/components/entity/ha-battery-icon.ts

@@ -0,0 +1,20 @@
+import { batteryIcon } from "../../common/entity/battery_icon";
+import "../ha-icon";
+import { customElement, html, property, LitElement } from "lit-element";
+
+@customElement("ha-battery-icon")
+class HaBatteryIcon extends LitElement {
+  @property() public batteryStateObj;
+
+  @property() public batteryChargingStateObj;
+
+  protected render() {
+    return html`
+      <ha-icon
+        .icon=${batteryIcon(this.batteryStateObj, this.batteryChargingStateObj)}
+      ></ha-icon>
+    `;
+  }
+}
+
+customElements.define("ha-battery-icon", HaBatteryIcon);