For a large group of people, lifespan of a phone is the same as the lifespan of the battery. They complain that the phone gets slower day by day, but they don’t know what causes it. Most of them come up with deleting WhatsApp messages so that the storage will be freed and phone will get faster.

Showing a persistent notification that “the battery has degraded and should be replaced” can increase the average lifespan of a smart phone significantly. These people don’t really care about shiny new apps or security patches. They just call people and send messages on WhatsApp. And maybe do some browsing on Facebook.

On iPhones, if the battery is degraded at least it drains up quickly and this hints that there is a problem with the battery. However, on most Android phones even 4-5 years old batteries last at least a day and they do so by reducing the CPU clock speed significantly. I know that Apple got fined for doing this in the past, but I haven’t heard any Android brand got fined for the same thing.

As anecdata, I have replaced the battery of my iPhone 6S at least three times and I will probably replace it again in a few months. And the phone is still very much usable.