can i change a battery in a garmin nuvi 300?

you don't mess with it if still under warranty.
After time up do what you want. (i am of the opinion that if it was put together it can be taken apart) search e bay for replacement battery,now look on the back to find the hidden screws, could be covered by small rubber bungs, small plastic cover caps then take apart to expose battery, replace old battery then reassemble.

wirecutterman
February 2010