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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.
If your battery isn't charging properly, don't immediately assume your phone charger or your battery is broken. Based on personal experience, the problem â and solution â may be much simpler than you think. If your phone or tablet isn't charging properly or at all, take a look at these 12 ways to fix a phone that won't charge. 1  How to save battery life on Android. 2  How to charge your Android phone battery faster.