iPhone 3G will not sync or charge after battery replacement
I recently noticed that my iPhone 3G's battery was running down stupidly fast so i decided to replace it. I checked that everything worked (which it did) other than my mac will not recognise it and it will not charge.
After looking around i found that it could be to do with the SMD element, but from what i can see it looks intact. I also think that the dock connector is working because whenever i plug it in when the phone is off, it turns itself on but will not say it is charging.
Any help would be much appreciated,
First of all take a look at this website regarding battery performance.
Two main issues i see every day regarding battery replacements are people leaving their WiFi and Bluetooth enabled (unknowingly, whenever a restore/update is carried out these settings are sometimes enabled by default). Having these enabled Drastically drains battery, reason being is because they are both constantly searching for a device/router to connect with, using as much power as possible to do so. Sometimes it is just a faulty battery and there is nothing you can do, however a majority of the time you can fix your battery with something as simple as disabling a few settings.
Regarding your Dock Connector
Does your home button work as well? If it does then the dock connection to the logic board should be fine. Take a look at the pins inside the dock, are any damaged/eroded?
Do you still have your old battery? If so, replace it with the new battery to see if the issue still occurs. This will help narrow the problem down to either the battery or the dock connector and will show you what part to replace.
Hope this helps!