Battery Indication

I have metawear C sensor. when i connect with android application and check the battery it will not show the perfect result.
sometime when i start and check, it will display 42% battery remaining and after sometime when i check it will display 73%.
How automatically battery will be charged .
And i have metawear R sensor also, in that sensor when i connect the data cable for charging suddenly it will charged and display battery level 99% . But within a very short period of time it will discharge.
Can you please tell me how can i know the actual battery level of my sensor ? This battery level problem happen with all the sensors .


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