salam...
I am an small time independent technician.
I am not so sure about your battery problem but double check by replacing your battery or battery connector. whereas about the searching part I have been having the same problem with after replacing display assemblies for some of my customers and most of the iphones were repaired and fixed by restoring only maybe its a bug or an an apple hole for all of us to fall in or its just me.
The date and time adjustment as well as calling myself did not work for me.
Malik.