Even though Walt made six of these fuel cells and attacked them to the Winnebago's battery with jumper cables, would it have been enough to spark it up? Probably not. According to ScriptPhD.com, the makeshift battery would only have churned out about 12 volts and 20-30 amps of current at the most.

Is the Breaking Bad battery work?

The metal filling and foil were acting as the two different metals, and we were being electrocuted by our very own mouth battery. Walt's explanation is fairly accurate but unfortunately such a simple battery would only provide a tiny amount of the power required to turn over an engine.

How did Walt make the battery?

In order to build an electrochemical battery, Walter asks Jesse to bring him the RV's brake pads and various galvanized metal objects and finds dish-washing sponges and KOH electrolyte solution from their chemical stocks.