The major problem with my friend was that instead of waiting till his devices drop to 20% or so, he plugs them in whenever not using them so charging from 80/90% range to 100%. That is Not A Good Idea though quite a few newer devices have workarounds to keep the battery from getting damaged as much (one of my devices won't start charging till it drops below 30% unless I double click the power button to override that behaviour. It also fast charges to 80% and then slow charges until I remove it from the charger.
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