Condition of Apple's Replacement Battery for iPad mini 4
I am familiar with the iPad mini 4, having several of them in my family and my wife and I using one side-by-side to read the news morning and evening. After almost five years of use, the battery life on my mini 4 began to decline enough that I thought it would be worth having Apple replace it. The battery was still decent but I was concerned about its potential life on the occasional long trips away from a charge.
A few weeks ago, I sent the mini 4 in to Apple for what I assumed would be a new battery. (My assumption, I don't think I recall seeing the word "new.") A replacement was returned quickly but after a few days, it was clear that this battery's performance was far short of my original battery, even at year three or more. It charges and discharges much more quickly than my wife's two year old mini 4 with the same use except that she uses much higher screen brightness than I do. I did not take a benchmark on the mini 4 battery I mailed in to Apple (I should have) but it appears to be performing a little better than the old battery but nowhere close to a new battery. This, even though the new battery indicates full capacity (not charge) on a couple of the apps based on Apple's developer APIs.
Does anyone know what the criteria are for replacements? Did I get an "acceptable" used battery, a factory defect new battery, or a new battery that has been deteriorating on a shelf for years.
I really don't want to go through the hours of time it takes to work though Apple support (disconnected and had to restart -- 80 minutes to get the process started) or the hours it has taken to restore logons in many dozens of apps with this replacement, but I would like to get a clarification as to what I got for the $100.
Needless to say, but just to avert first level responses, my observations are controlling for charger, cable, usage time, etc. There is no mistake in interpreting that this replacement battery does not perform as well as the original, my wife's two year old mini 4 or, in conversation, with those of other family members.
Thank you in advance.
iPad mini 4, iPadOS 14