BQ40Z50-R2: During high current discharge, Full Charge Capacity(FCC) changed to 1000 mAh to 250 mAh

Hi, 

We are developing smart battery using BQ40Z50-R2.

We did Chem ID and Learning process, so made golden GG file. 

When we using our battery,it was high discharge condition(more than 30A), suddenly battery RSOC value became to zero, although battery voltage does not indicate zero status. 

When this issue happen, I read the register using BQ studio. And I found that FCC has been reduced to almost 1/4. 

1. How this kind of RSOC jump(FCC jump) can be happened? 

2. How can we fix this jump problem ? 

3. I found some similar issue that indicates it is related to Ra table issue. 

  3.1 GG from Leaning cycle VS GG from GPC tool, which file should I use? 

  3.2 What exact Ra value means? Is there any document about this?

  3.3 What is difference between R_a0 and R_a0x ? What 'x' is stand for?

Thank you.