Chosen Solution

Replaced battery in iPhone 6. Plugged it in to power with original Apple cable/charger, and all I get is the white screen with black apple logo. Comes on for a few seconds, goes black, comes on again. Over and over again. Have tried holding power/home button, plugging in to computer (iTunes does not recognize), and reseating battery. Do I need another new battery?

iPhone is not properly recognising the battery. Reseat / Replug the battery cable and try turning it on again. If it still does the apple boot loop then you have a bad replacement battery.

Connect to computer, if the iTunes doesn’t recognize,press and hold the power button and Home button at the same time until you see the Apple Logo.