Where to buy High quality replacement batteries?

Dear Dimers,

I have couple of phone and apple airpods 2 battery is gone, the devices as such is good only battery is the issue, where can I buy high quality battery please suggest? 

Came across this site  https://makerbaz...n/  and https://www.hnhcar...m/ is it selling high quality batteries or just like majority of shops those batteries will be dead in 6 months?