Questions about the iPhone 6s battery recall

i have 2 iphone 6s's, both of have serial numbers qualify battery replacement according site: https://www.apple.com/support/iphone6s-unexpectedshutdown/
1 phone losing battery power faster when new, typically dropping 40% in day minimal use , minimal background apps running. other phone dropping 0 power each day under same minimal use. have not been able confirm either phone suffering power-off issue when battery starts low per se.

so, if bother make appointment have these inspected @ apple store, how "test" phones? serial numbers confirm have bad batteries , replace them, or argue me batteries "old" , performance within specs? apple store 80 miles house, rather not waste time if won't resolve this.

 

it took 2 trips me. first trip ran diagnostic , requested me reset device , see if fixed before replace it. second visit, replaced on spot.

 

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