Using the adb shell
tool in combination with the am
command, you should be able to launch the browser on your Android device, and point it to an url of choice.
Something like (don't have a device with me at the moment, so cannot test):
adb shell am start -a "android.intent.action.VIEW" -d "http://your.url.here"
Put that in your bat-file and run it. It should automatically find a connected device. If you would also like to wait for a device to become available, check the adb
documentation: this can also be done.