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I have an old iPhone 4 which is slower than snailshit hibernating in a drawer. Rather than pay Apple an extortionate amount for a battery replacement (which they probably won't anyway in such an old phone) I could get one fitted by a local repair shop for about $20. Given that its not an "official" Apple replacement and under the impression that it will charge and discharge normally, will that battery replacement allow the phone to run at previously normal operating speeds?
As Hypoluxa pointed out above, updates could potentially spoil any chance of getting the phone to operate anywhere near as well as it previously would have. Putting an older version of the phones OS back on is not an option as, even if it were possible, newer apps wouldn't run on it.
Therein lies the "planned obsolescence".