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No, not necessarily, but it can cause a minor issue. iPhones use a Lithium-Ion battery for its power, using while it's charging won't necessarily ruin the battery, but if you're using the phone while the battery is in the charging process, it can cause the phone to think it has more power than it actually has.
At the beginning, i am pretty sure it used to charge all the way to 100%. Now it only charges up to 57-60% and then says not charging. It detects the charge cable but it doesn't' charge. And the battery doesn't drain while I am charging it.t the beginning, i am pretty sure it used to charge all the way to 100%. Now it only charges up to 57-60% and then says not charging. It detects the charge cable but it doesn't' charge. And the battery doesn't drain while I am charging it.