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Unfortunately, they do not define it that way.
And there are exceptions based on capacity and how long you guarantee the battery capacity will be good for. IIRC, if it still has 70% capacity by 3 years time, it doesn’t have to be replaceable at all.
Can you really guarantee that? I mean, it’s pretty much dependent on individual usage.
Sure you can. Car manufacturers do it today.
You will have to define “3 years” as well. It can’t be a blanket 3 calendar year thing, it would have to be X number of cycles which the average user would realistically hit with 3 years of usage. Not someone glued to their phone playing games all day that need to charge three times a day.
