Thanks for a great tutorial, but apparently the design for the battery compartment has changed since this was made. It now comes with just one bendable lead on the top end and one on the bottom end of the compartment, which makes soldering to the battery compartment less straight forward. seems like it might be a manufacturing error. I got a replacement sent to me when I realized this, thinking it was a one-off, but the replacement has the same design. It's weird because even the (much less descriptive) guide that comes with the set shows 2 bendable leads on one end like yours.