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bq27750 低溫FCC問題

hi all :

             電池組3000mah需要在負20度c環境下使用  ,所以做了GPC RB Table .

             將生成後的table燒入後測試 .

             當電池在-7度左右時 靜置狀態. FCC從2900mah , 直接降至100mah .

             請問這是什麼問題造成?