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Hello Iphone S5 se reinicia en bucle indefinido I have 2 iPhone s5 Iphone S5 restarts in indefinite loop how do I proceed? best regards

Does the apple logo immediately go off upon charging cable unplug? Is this only occurring when the charging cable is plugged in? If both apply, the battery is either not connected or the battery needs to be replaced due to it being faulty. Here are links to where to get battery and guide from iFixit: How to replace the battery in your iPhone 5s iPhone 5s Battery iPhone 5s/5c/SE (1st Gen) Battery Adhesive Strips