I had watched a video on how to install, which did a pretty good job of explaining the steps. It fit just fine. The tools were a nice addition, but I really needed a fine (possibly 32 gauge?) wire stripper; I made do with a pocket knife that was way too big for the job.First time I reassembled, I obviously didn't make a good connection on the display, but I disassembled and reassembled, and it worked. $13.59 and a half hour of my time beats buying a new device.The replacement kit for my Garmin (battery and tools provided) was excellent. Inclusion of the tools was an outstanding feature. Tools in a standard jeweler's set would not have worked. The plug-in connection worked well. After installation operation was restored.There were two factors that complicated installation slightly. The leads were reversed on the new battery so it was installed "upside down" (not an operational problem) ,I think the Garmin would have worked without reconnection of the speaker leads, but this connection was difficult because the leads of the factory installed and new battery were different construction - one was solid copper and the other multi strand - so the two could not be easily twisted together to hold them in place while the connection was glued or soldered.My 6 years old Garmin 500 was dying around 45% so I thought it needs a new battery, but new battery does the same thing, oh well.Works for Garmin 820. Take your time when prying out the screen to not break it. Have patients and when prying out the screen insert the pry tool in the edge of the screen then slide the pry tool to remove the adhesive tape. Don’t try to force it by pulling it beforehand.The original battery was 700mAh. This one is 600mAh. I'm not seeing a big improvement over the battery that was 3 years old. Plus I broke the wire off of the speaker in the process of replacing the battery.Bought this kit to swap the battery in my 7 yr old Garmin Edge 500.Two wires are plugged, the other two will need to be soldered to the speaker. It all worked out well, spent about a half hour doing this swap. Just take your time with disassembly, take photos of you need to, and don't cook the speaker with your soldering iron.Battery charges fine, after 2 hour bike ride still had 91% charge. I'm happy!Both I and my friend replaced our Garmin 500 batteries. These "new" batteries are just as poor as my 9 year old and his 10 year old battery. They will discharge about 4% - 5% when not in use (36 hours), and after a one and a half hour (1 ½) ride they will use about16-20%; no better than the old batteries.With my original battery, I didn't need to recharge after about 10 days