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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.
I just got my iPhone for Christmas and the battery is terrible. It is fast and does everything fine but the battery lasts like 2 hours. I have turned my brightness down and Bluetooth off etc and the battery is still bad. It drained 30% today in about 20 mins and it also takes about 30 mins to charge.Is there anything I can do or is there a problem with my phone.Thanks. have turned my brightness down and Bluetooth off etc and the battery is still bad. It drained 30% today in about 20 mins and it also takes about 30 mins to charge. Is there anything I can do or is there a problem with my phone.