Its akin to not driving your car in the redline constantly - sure you can do it, but its going to reduce engine life.
Its the same with batteries, you keep them at 100% constantly they will wear out. Its just a limitation of the technology.
Some devices now try and use "machine learning" to determine max charge, for example iphones will maintain a medium charge throughout the night then do a final top up charge to reach 100% just before you wake up.
> Its akin to not driving your car in the redline constantly - sure you can do it, but its going to reduce engine life.
Yes, of course. That's not the issue, though.
> Some devices now try and use "machine learning" to determine max charge, for example iphones will maintain a medium charge throughout the night then do a final top up charge to reach 100% just before you wake up.
That's different and even opposite from advertising X max charge and only delivering 80% of X as the max charge. What I referred to is a bait and switch, where the manufacturer advertises one thing but provides another. Your example justification, however, is not a bait and switch but aligns the technical MVPs and marketing promises.
The situation is similar to purchasing a fridge that only operates at 80%. All food spoils more quickly, but the fridge lasts longer. If that had been disclosed, instead of the opposite implication from the marketing, then consumers would have almsot certainly made different purchasing decisions. That is why these sorts of things are generally illegal.
In your car example, if a car is advertised with 400 HP but never goes above 320 HP, that's called false advertising. Sure, the engine can get to 400 HP tested on a bench, but that's not why the car was purchased.
Right, so what vendors are doing now is calling batteries consumables that last one, maybe two years with the default 100% charging limit to get max run time on battery.
Consumers can either accept this and pay for a new battery every few years, or if they want they can limit to 80% and get way longer life battery life if they can live with the reduced runtime.
I'm not aware of any vendors claiming x capacity battery with mandatory limiting charging to 80% of x, rather its an option you have the choice to explicitly enable.
