My iPhone 13 Pro’s Battery Capacity After 8½ Months of Regular Usage

Three years ago, I had no idea what Chargie was going to become – world’s #1 phone battery protection system. I knew the basic principles of charge limiting and the positive outcomes it has on battery health, but at that point in 2019 they were only theoretical, or based on what others had studied.

Now, there are over 27,000 Chargie devices out there and countless testimonials of people using it and telling us (publicly or over email) how Chargie had changed the entire course of their battery life and how it saved them money, time and effort.

I’ve been personally checking my own iPhone 13’s battery every couple of days to catch any degradation occurring. I bought it new on Nov. 2nd, 2021 – about 8½ months ago.

Here’s a short screen recording I did today to show you my phone’s battery health. I did a movie so that there’s no doubt – you can see the warranty expiry date in the About screen (one year from the purchase date) and then the current battery health under Battery.

YouTube video

Of course, results may vary, but I’d be curious what your own iPhone’s health is right now. Many of you may have the same results because you happened to charge it often and properly without a Chargie, yes, it can happen. Still I’m pretty amazed by the rock-solid 100% after all this time, while a test iPhone 12 that hasn’t been used with a Chargie device since Nov. 2nd, is now at some 88% health. It had 99% health when I handed it over and had been religiously charged on a Chargie as well since November 2020.

The iPhone 13 Pro has been charged to 80-90% daily on a Chargie C Basic and a Chargie A. I used the Charge Scheduler to limit the overnight battery level at 50% and avoided fast charging when possible during the day. I also avoided deep discharging the battery (<10%). The phone’s motherboard has been replaced a month ago on warranty (bad signal), but that didn’t affect anything related to the battery.

I’ll write another post like this when battery health drops to 99%.

So if your phone’s (Android or iOS) battery is showing wear, or better, if you have a new one, my advice is to start using a Chargie – you’ll prolong battery life and improve your overall experience with it. You’ll forget about the initial Chargie investment, but will never forget the great experience that follows.


  1. I have been using Chargie for a few years now, and am very pleased with the results on my almost 4 year old Huawei tablet which I am writing this reply on.
    I have measured the approximate battery degradation and it appears to be around 12%. Using Chargie the state of charge has very rarely gone beyond 80 percent, and it has rarely been allowed to drop below 30 percent.
    Because the tablet is reasonably basic it only charges at around 750 mA, and so the temperature rarely exceeds mid 20’s Celsius. I have the temperature limit set to 30 degrees and the battery has hardly ever exceeded that.
    The tablet has had hard use at times and has been charged/discharged twice a day at times, but using Chargie to limit the maximum charge.

    1. However, my mobile phone (Xiaomi Redmi Note 8T) shows different results after two and a half years. The battery degradation appears to be between 20 percent and 35 percent. It varies each time I measure it. I haven’t measured from zero, around 10 percent to 90 percent is the most I have done, and then proratered the results to equal 100 percent capacity.
      The phone runs hotter than my tablet, but rarely exceeds 30 degrees Celsius. I have the temperature limit set to 35 degrees.
      Again, I do not let the phone discharge too low. Around 35 to 40 percent is when I start charging, and I have the Chargie set to 75 percent, or sometimes 80 percent.
      The battery degradation seems quite high considering I have been using the Chargie, but I am not too sure about the accuracy of the capacity results.
      Also although the battery is a nominal 4000 ma/h, I cannot be certain that it was that when new. If it was less then this would give a lower degradation result than my calculations.
      The battery still gives me about the same amount of usage in between charges as it did when it was new. Typically I charge to 75 percent and with my light usage this will last 2 days before it drops to 40 percent. This is a bit subjective but the battery still appears to have the same runtime as it did when new.
      So, has my phone battery degraded by 20 percent, 35 percent, or very little?

      1. Update:
        I decided to do a battery monitoring system calibration on my tablet and phone. I couldn’t remember the last time I carried this out……… So I discharged both devices to zero until they switched off, then fully charged them to 100 percent. I had an energy meter plugged into the power supply to measure the milliamp hour capacity.
        This time my tablet recorded an 8 percent degradation, and the phone was 13 percent.
        I’m happy with that. The tablet is almost 4 years old, and the phone is 2 and a half years old.
        My phone is switched off overnight, but it is still on for around 16 hours a day. Even when idle a mobile phone is doing lots of unseen things in the background so it is still undergoing use.
        Personally I think that around 5 percent degradation of my phones battery per year is very reasonable, and this is thanks to Chargie.

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