there's more to fixed batteries than planned obsolesce i think - many don't keep their phones very long because they have to have the newest crap, plus certain plans encourage "upgrading" at little or no cost - batteries generally don't give out during that time (i've had phones for quite a few years and never replaced a batt) - one reason for them is to make the device thinner and another, i would guess, is that it cannot be completely powered off (think surveillance)
That's probably the most telling thing right there. Most are never going to see their battery completely degrade because they trade up every few years.
A modern battery, if given a little care, will last for 3-4 years - or even longer. My 5 year old device is just now getting to the point where I need to charge it every day. I don't really care (I could replace the battery, it's not terribly difficult in the device) but it's showing other problems like flash degradation (you can't beat physics in this case) and the protocols it operates with will be gone soon. It had a good life.
flash degradation
Yes, it has expandable storage, but the OS and other data reside internally.
That's what I'm referring to - you can tell I'm running out of spare blocks just because the thing is getting slower than frozen snot no matter how many times I go in and clean it up.
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