Article doesn't mention some common issues: a) If battery already has significantly reduced capacity, every % of charge is charge that may be needed by user. B

Article doesn't mention some common issues: a) If battery already has significantly reduced capacity, every % of charge is charge that may be needed by user. Battery going empty just when device is needed, is often worse than battery capacity approaching "useless" even faster (especially if battery is replaceable). And even with near-dead battery: power banks are a thing. b) Article says up to 4x longer lifetime if battery is never charged above 80%. But it describes that as "more juice delivered to device over battery's life". Yes: charge-discharge cycles are 'cheaper' in the lower-to-middle of a battery's voltage range. But that's not the same as "will live 4x longer". Modern Li-ions will simply degrade over time, even if you're not using them. Degrading will just go faster if battery is (ab)used regularly. c) Many devices don't have an option to limit charge to a set %. Doing this manually doesn't work too well.