BQ40Z50-R2: BQ40Z50-R2 SOH query

Hi 

I have a query need your help.

After learning cycle, the FCC updated and larger than design capacity.

but the SOH is only 99%. Why the SOH doesn't reach 100%? The design capacity is 4750mAh. After learning cycle is completed, Qmax has been updated and the FCC updated to 4850mAh.

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Waiting for your reply.

Thanks

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