These instructions should be similar to any of the older Garmins with the flip up antenna
Looking at your nuvi from the back flip up the antenna. You will see two tiny orx screws on the antenna. Remove them and carefully seperate the antenna housing. Pay attention to how the antenna flex is seated because reassembling the antenna housing can be tricky. On the left bottom side the pin assembly that holds the antenna in is spring loaded. Pull the pin towards the center and you will be able to seperate the antenna housing from the unit. Underneath you will find two more tiny torx screws holding the main housing togather. Remove those two screws and you are almost home. Now you need the special plastic tool that you can get on ebay. The tool is used for opening ipods without mangling them. Gently pry the case apart with this tool. Start where ever it is easiest to get the tool in. Once opened you can figure the rest out for yourself. The battery is flat and rectangular and is seated behind the circuit bourd attached to the back cover.
You can see this plastic tool on the video I posted on changing the battery on a Nuvi 760
Looking at your nuvi from the back flip up the antenna. You will see two tiny orx screws on the antenna. Remove them and carefully seperate the antenna housing. Pay attention to how the antenna flex is seated because reassembling the antenna housing can be tricky. On the left bottom side the pin assembly that holds the antenna in is spring loaded. Pull the pin towards the center and you will be able to seperate the antenna housing from the unit. Underneath you will find two more tiny torx screws holding the main housing togather. Remove those two screws and you are almost home. Now you need the special plastic tool that you can get on ebay. The tool is used for opening ipods without mangling them. Gently pry the case apart with this tool. Start where ever it is easiest to get the tool in. Once opened you can figure the rest out for yourself. The battery is flat and rectangular and is seated behind the circuit bourd attached to the back cover.
You can see this plastic tool on the video I posted on changing the battery on a Nuvi 760