First one worked perfectly as it was seen in the video. The second one teared immediately. I lifted the battery a little by a spudger and used the tweezers to pull out the white part and grabbed with my fingers and gently pulled it slowly, which worked.
Reconnecting the battery connector was a bit difficult in my case. The cable that comes out of the battery was a tiny bit too long, or that I placed the battery a bit too high (i.e., too close to the top of the phone). It took me several frustrating minutes of fiddling with the connector for it to sit right into the socket. I was not sure if that was connected correctly but, alas, the phone came back to life when it was turned back on.