The other way. You can watch the red and black line connecting to board by soldering at 0:46. Pick up the lines from old battery, and solder to new one's connecting points. You need soldering only 2 points. It's easier ways than this video. But I prefer a way to reuse the board. If new board is defective product. It will destroy the main board of fenix may be. I've broken one nuvi with a defective board. Is the board on the your new battery, it is no problem? How to open case. Fenix 3HR https://www.youtube.com/watch?v=m9CttkoLh48 Fenix 3 https://www.youtube.com/watch?v=lResTsIUDIE epix https://www.youtube.com/watch?v=kjgBpeZlOvE