Batteries N Accessories BNA-WB-P4148 GPS Battery - Li-Pol, 3.7V, 1250 mAh, Ultra High Capacity Battery - Replacement for Garmin 010-00621-10 Battery

Satisfied so far. Came fully charged. I let my Nuvi run on the battery and it seems to last a good while--an hour or more. Best to find video on Youtube on replacing the battery before you try. Have some double sided tape on hand before starting, you'll need it. My replacement battery came with a small phillips screwdriver to remove the back of the case. But the circuit board that you have to remove to access the battery cable plug was secured with tiny Torx head screws in my particular Nuvi 205W device, and a tool for that was not included. Luckily, I had a small Torx driver on hand that came with a battery replacement kit for my Toshiba laptop battery, and it fit. If you're a good DIY'er, you may be able to remove the tiny Torx screws with a "tiny" phillips driver.

Note, when removing the old battery, you'll find out that it has been installed with double sided tape. Being very careful, you'll have to slide something very thin between the battery and the case to very slowly pry it out. Take your time and wait for the double sided tape to start "letting go". Don't rush it or you could crack the Nuvi's case. Then, you'll have to put a small piece of double sided tape on the new battery when you install it.