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Help for the design of BQ51050B shematic

Good morning ,

I want to test the receiver BQ51050B for the charging of a thin battery (25 mAh) 
I calculated the different value of resistors and capacitors with a termination current of 2.5 mA (10¨%) 
But I didn't find how to calculate the C3, C4 and Ros; it's noted in the datasheet that C4 is beteween 4.7μF and 22μF

Can you help me in my design.