Add Plug-In Battery to introduction text (#159)

Author: DCSBL

docs/introduction.mdx

@@ -11,7 +11,7 @@ With the HomeWizard Energy platform, you can get insights in your energy usage.
 
 ## HomeWizard Energy API
 
-The HomeWizard P1 Meter, Energy Socket, kWh Meter, and Watermeter (referred to as "device") each have a local API that allows you to retrieve the latest measurements or control the device. You can access this API as long as you are connected to the same Wi-Fi network as the device and the API is enabled in the HomeWizard Energy app. This API is designed for integrating your device with personal automation, home automation, or data graphing systems. Note that it is not possible to retrieve historical data through the local API, as this data is not stored on the device itself.
+The HomeWizard P1 Meter, Energy Socket, kWh Meter, Watermeter and Plug-In Battery (referred to as "device") each have a local API that allows you to retrieve the latest measurements or control the device. You can access this API as long as you are connected to the same Wi-Fi network as the device and the API is enabled in the HomeWizard Energy app. This API is designed for integrating your device with personal automation, home automation, or data graphing systems. It is not possible to retrieve historical data through the local API, as this data is not stored on the device itself.
 
 ## Terms and Conditions