iPhone 7 Battery Replacement

Today I noticed my iPhone 7 losing battery power quite rapidly. It says I need to service the battery. Should I keep iPhone 7 and get a new battery or upgrade altogether to the latest iPhone?

How do I go about doing this? Has anybody done this before?
 
Ever since Apple lost that lawsuit where they ****** people to go back to them for repairs, you have lots of choices to fix your iphone.
 
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