PSoC BLE 101: #4 Adding Battery Level Service and Testing with CySmart 

http://www.futureelectronics.com/en/Search.aspx?dsNav=Ntk:PartNumberSearch%7cPSoC%7c1%7c,Ny:True,Ro:0,Nea:True,N:4294938421 . In this lesson we will take the Find Me profile you built in the first two lessons and add a Battery Level service. This is a very common thing to do because most Bluetooth Low Energy devices are battery-powered, often with just a CR2032 coin cell. Open the BLE component customizer and edit the profile to include the new battery service. https://youtu.be/zund3NXLbOw