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changed my iphone 6 battery becuase it was only lasting for 2 hours, after i was done with replacement, phone powered on and everything but the battery came dead and it turned on when i plugged it in but it wouldn’t charge. Every minute or so it would restart also

Hi Brady, When you replaced the battery, which guide did you use? I recommend to follow this guide here on ifixit. Here is what I would also check on/do: (1) I would first check if the battery cable is correctly attached (that is, even) to the connector. Then: (2) Turn the iPhone off (with the charging cable attached and plugged in) and turn it on again (3) Now allow the new battery 3 to 4 hours to be charged. This is a way of trouble shooting in order to see if during that time the battery is being charged or not. Steffen