My Kindle 3 was 12 years old and the battery died. Given my very limited skills in working on devices (that is, taking them apart etc), I was happy to have found this guide. With some difficulty opening it, I managed to replace the battery. And, thanks to the tip about the silver washers I knew what to do with them when I saw them on my desk after I had closed the kindle and it was dead. So, I opened it again, put the silver washers in place, and, voila, hopefully I have another 12 years with this. I prefer the older Kindles, with no backlight. So this guide was immensely helpful. tnx