20 - 30 分
Got a used 3GS. It's battery was making the phone wonky
I got the wrong battery (a 3G battery) through a mix-up. Turns out that it made the phone crazy. iFixit was happy to replace it. Through the process, I went through the replacement procedure 4X.
The guide is terrific. Could use a line-diagram for the cable connection point that has the swiveling lock (step 6). All other cable connections are snap connections. This particular connection could be easily ruined trying to "snap" it. The instruction refers to a "tab" - but any of the connectors could be referred to as "tabs". A line diagram would also clarify the ambiguity regarding white/black color schemes on this step.