I had the local CELLAIRIS store install a new battery in my iPhone 5 on Wednesday, March 18, 2026. I also purchased a new charging block and charging/sync cable. I am very satisfied with the performance of the new battery and necessary accessories. See the attached Excel spreadsheet for the details. The total cost was a mere $109 USD.
The accompanying Excel Workbook contains six spreadsheets: two charge sheets and four discharge sheets. The charge spreadsheets contain graphs (linear regression curve fitting with equations and R-Square values). The linear regression statistics show that the charging process is highly linear.
I plan on using my old iPhone 5 primarily as a two-step authenticator device. Gone are the days when I used (abused) my phone with playing iTunes music.
Numerical Explorations 