How come we have to always deplete the energy of a phone battery or power bank when we first buy it and only then do we charge it?

Question

I’m sorry for the bad english.

In: Engineering

Answer 1

It doesn’t matter anymore, but with old batteries having a charge constantly run across the electrolyte would make it more efficient in the long run by distributing charges more evenly

Answer 2

You don’t, and should not do this with lithium ion batteries. NiCd and NiMh batteries may need this to keep the batteries healthy, but not with Lithium-Ion. In fact, it’s best to keep them within 20-80% charge, and not let them fully discharge or charge.

Answer 3

This may have been true for old phone batteries but now its not necessary, you can charge your smartphone/powerband whenever you want. Your device’s lithium-ion battery doesn’t care if it’s at 10% or 80% capacity; it will charge just fine without destroying your device’s longevity.