Battery Replacement app that mirrors iPhone battery?

Jan 19, 2019
Sorry about the ambiguous thread title. Anyway, my father replace the battery of my iPhoneSPlus. After about a month the phone started to restart over and over again w/ about 5 minutes in between each restart. We took it to a IPhone fixing facility where they said that the battery short circuited the phone and that replacing the battery would only tac on another week or so of life. I brought that information to my father; but prior to buying a new iPhone all together he’s interested in an App he heard of that takes “control” of aftermarket batteries and convert their milliamps to that identical of an iPhone. Which would essentially mirror an iPhone battery. I haven’t been able to find this app and was wondering if anyone could assist? Thank you guys!!
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