Why does my mobile phone battery goes dead after only one hour?

Why does my mobile phone battery goes dead after only one hour?

I've just installed a Chigee AIo6-LTE device but after only 30 minutes the connection got lost with my Mobile phone using Android.  I was not able to reconnect with the chigee device so i had to stop riding and make a new bluetooth connection.  Then later, after only 20 minutes the battery of my mobile phone was empty while it was charged to 80%.  ... Is it normal that the battery of the cellphone goes dead after only one hour of using the Android connection with the Chigee device?  ... If so, this device is completely useless for me as i'm driving for several hours every day.  Any feedback or suggestions?