is it necessary to replace the alternator when replacing the battery?

[Adam]

My car is a 2015 Mazda 3. It has 75,000 miles already and I had just changed my battery. Should I have changed my alternator as well or not always? The reason why I had to change my battery was because I drive a lot and have lots of gadgets (gps, dash cam, etc.) connected. I thought it was necessary because my last oil change the mechanic tested the battery and there was leaking, failed test, and the terminals corrosion. I thought it was time.

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[Richard Kirshy]

Unless it is faulty.
No reason to replace a working alternator.

[Author]

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