Chosen Solution

Sometimes my battery meter stays long at a particular percentage, and then quickly drains 2% or 3%. So I’ll be on 50% for about five minutes, and then quickly drain to 49%, 48% in a minute, and then stay at 47% for a longer time. The battery seems fine but the meter is unreliable.

Replace the battery or buy the Apple Smart Battery Case here is a link to the website https://www.apple.com/au/shop/product/MG