Here's the catch with that battery connector: The pins are nearly impossible to reach with a normal soldering iron. Well, without clipping a capacitor, or melting something. If I were you, I'd remove the connector, desolder the ribbon from the battery PCB, and just use thin wires to connect the battery to the board.
** If you do mess up the pads while soldering, you can jumper the wires to small components located underneath the lower EMI shield. There's schematics available, hint: search on google "site:wenku.baidu.com iPhone N90 murata" its the first 2 links.
Thank you for your technical help. I will be sure to ask you more before I can do anything once I actually get to the job of replacing it. I will be returning to the USA the 22nd and will post back. Can you provide pictures of what you mean? Although I believe I get it I definitely want to be sure.