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CCS/CC2650: Problem with battery service result

Part Number: CC2650

Tool/software: Code Composer Studio

Hi TI team, 

I implemented the sw app project zero into my CC2650LP, after that I add a battery service to my project from "ble_sdk_2_02_02_25" and I can see it in my phone app but the result who I had look a little weird.


First result is battery level = 100% , I think it's normal result because I connected my launchpad directly with usb into my pc with all connection jumpers are in.


Second result is battery level = 73% , I connected my launchpad directly with usb and removed the GND, 5v and 3v3 jumpers.

I didn't understand this result , why it's 76% ? why it's not other number ? By the way after reading or writing an instruction the battery level get down to 61% .

Can some one help me understand those results.