I want just export the battery level to Blynk using Automate. I used Battery level? and HTTP request blocks in Automate to write battery level to my project virtual pin V41.
The HTTP GET request block in Automate uses the following Request URL:
http://blynk-cloud.com/auth_token/update/v41?value={battery_level}
Note that battery_level is the Automate variable that stores the value of my phone current battery level. I intend to use this value to keep my phone battery level between 30 to 80 % charging. The phone will start charging when battery reaches 30% charging and stops when reach 80%. I think this is a good charging strategy to maximize battery life.
I am also planing to include this feature in a tablet dedicated to my home automation project that runs Android Blynk App 24/7.
Everything is working perfectly. Thanks @scropion86