Taifun
1408
Read the complete itoo thread and search for BLE examples.
Try something simple first to understand how the extension works. Learn from available examples. In your case the battery checker example
For your purposes you have to modify procedure batterychanged to send the data regularly to your device.
If you get stuck, post a screenshot of what you have tried. Any: Before taking the screenshot switch the language to English!
Taifun