Walt and Jesse need power to jumpstart their RV, so they create battery cells in order to generate current. Walt explains to Jesse how their creation, although it looks unconventional, will be a functional battery. He lists some of the components of a battery and how they are making each.
When Mark loses power on Mars, he scavenges the Rover 1 to double his battery life. It is freezing cold, and he is faced with a dilemma: use the heater to stay warm and burn through half his battery every day, or slowly die from the cold to save battery life.
Beakman challenge: make a can come to you when you call it. Beakman rolls a can away and it rolls back. Using a coffee can, two plastic tops, rubber band, small sticks, scissors, tape and a weight (like an old battery), Beakman creates a coffee can that, when rolled, causes the rubber band to twist up. The stored energy of the twisted rubber band has to go somewhere, so it unravels it self causing the can to roll back where it started.