I have a MacBook Air from 2017 and its original battery has started draining very fast. The Apple original battery will cost me around 17,000 INR so I am thinking of going for a third-party battery. Is that a wise decision?
There is always an element of risk to 3rd party batteries. That said, a reputable supplier that warranties the battery for a period should be fine. In my experience OEM batteries generally lasts longer and use better quality components.
So it is up to you to decide if the price premium is worth it in your use case.