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WEBENCH® Tools/BQ40Z50-R2: BQ40Z50 and GPC Tool, CHEM ID not in list

Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50, BQSTUDIO,

Tool/software: WEBENCH® Design Tools

Hello,

I started to do configure the BQ40Z50 for my application, 2S lithium polymer cells.

The problem is the GPC tool report two available chemistries... not in the list in my BQ Studio :

Chem ID    max DOD error, %    Max R deviation, ratio
264    2.18    0.12
1280    2.72    0.26

I tried chem ID update, no luck. What can I do ?
What does it mean these Chem ID are not available for my device ?

Thanks for your help !