Took my iphone for battery replacement, apple did ...

Took my iphone for battery replacement, apple did diagnosed said need new battery it's just 4 months old * best buy tried to lure me to pay extra $30 for screen cracked , told him my screen not cracked it's just screen cover took my cover to show him .I .not here for screen look , I am here for battery replacement as recommend by apple they did test remotely , he said No we can't replace it , it show 80 percent , look my. Friend the battery in red although it show 80 ,, No arguing . Will mail it to Apple . Do not go there just go Apple store better Experience better treatment.