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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.
Both Mophie cases and the PhoneSuit case are designed to be switched on to charge a drained phoneâand all three have the simple drawback of needing to be manually turned off. Itâs not hard to do, but it may be hard to remember: If the cases are accidentally left on, their batteries drain along with the phone batteries.The actual total battery life of your phone life is still longer with the cases, but power users might run out of juice without realizing the backup has been drained already.tâs not hard to do, but it may be hard to remember: If the cases are accidentally left on, their batteries drain along with the phone batteries. The actual total battery life of your phone life is still longer with the cases, but power users might run out of juice without realizing the backup has been drained already.