You managed to create lithium batteries lasting for 100 years (meaning an iPhone user can scroll for a long time until the individual dies of old age without stressing if the phone will run out of battery). To put it into perspective: Nuclear Submarines can go on without refuelling for at least 50 years, so if you double that lifespan on a lithium battery: how would it shape modern electronics? What would it be like having a battery that can last an entire century?
That would mean iPhone & Android users don’t have to recharge every 10 hours or so (becomes every 876000 hours) meaning let’s say you bought an iPhone whilst in school it’s a full bar, by the time you are at old age living your golden years (it hits 5%) and throughout your entire life you forgotten that phones need to be recharged due to having a device that can last basically forever due to the battery being that powerful & having a long lifespan.
That also kind of proves OP’s point though. 3G was shut down, making an iPhone 3 pretty much useless at this point. You can use these things a lot longer than they want or expect you to, sure, but 20 years is a stretch, and 100 years is untenable.