It's time for another team event

I'll ask for 3 tasks over the next 24 hours. The first team to complete all 3 will win 50 team points.
First task:
Post a picture of 3 batteries stacked on top of each other, balancing...
Bonus round:
Guess how many batteries I have in front of me. The closest person to the actual number wins 50 points for their team.