I'll tell you right now your phone wont last a decade.

That battery, even with light usage, will eventually degrade to the point you'll have to charge it multiple times a day to keep it alive.

and then you'll have to do the math and decide between getting a new battery and just getting a new phone.

Thats the decision i had to make when I needed a battery for my old phone.. Did the math and found the cost of a new (to me) used phone was close enough to the cost of the replacement battery + labor that it was more value to me getting the newer phone, with newer OS, and still in the receiving update window than putting a aftermarket battery in my old phone.

Granted, the math gets heavily skewed in favor of a new battery if you are well experienced in cellphone disassembly and know you can do it without breaking the screen or back. I'm not, and any savings would go out the door if I broke anything, which is why I was going to let a professional do it.