Hi,

Here is a link which shows how to replace the battery. They also supply the battery and opening tools

https://www.youtube.com/watch?v=O_TV-HBC...

Here is another link where you can purchase the battery.

http://www.amazon.com/Garmin-Nuvi-265W-B...

As for the mini USB connector, you may have to remove it first to see if there is some securing lug differences to a normal mini USB and then try Ebay where there are plenty of options. Here is a link

http://www.ebay.com/sch/i.html?_from=R40...

Also, for what it is worth, here is the pinout for the Nuvi mini USB port.

http://pinoutsguide.com/GPS/garmin_nuvi_...

Hopefully this is of some help.