My Sony HDR-SR7 HandyCam still works fine for my needs, but recently would no longer retain the proper date and time when the battery pack was removed. Sony's authorized service center wants over $306.50 minimum to do anything to the camcorder, so I took a chance on trying to take this apart myself. Even though I couldn't find a YouTube video on my specific model, just watching a couple of other videos gave me enough confidence to at least try taking this thing apart. Luckily, I was able to get it apart in such a way that I think I can get it back together. I think I found the internal battery I need to replace too. It is a Panasonic ML621 rechargeable lithium coin cell battery. I'm having a hard time finding a reputable source to order one from, so if any of you know a source you trust that seems to have this battery in stock, I would greatly appreciate a link.