It works only when each battery has positive and negative poles. In the Bhagavatam, it’s stated that both the Good and the bad appeared from the Lord’s chest and back respectively to balance the rate of birth and death.
Krishna’s external energy consists of all that is matter: the material world, the laws of material nature, material bodies, and so on. The external energy is temporary and full of ignorance and suffering. It is inert by nature and must be moved by spirit. The material world is a tiny fraction of God’s creation.
We finite spirit souls are expansions of Krishna’s marginal energy. We can choose to live in the spiritual world or the material world. Or, to put it another way, we can be deluded by matter or illuminated by spirit.
Both the external energy (matter) and the marginal energy (we souls) can become fully spiritualized by contact with the internal energy through acts of devotion to Krishna (Bhakti yoga).
“The Supreme Lord has nothing to do, and no one is found to be equal to or greater than Him, for everything is done naturally and systematically by His multifarious energies.” –Svetashvatara Upanishad 6.8
The Triguni maya(materialistic energy) i.e. Satava, Rajas and Tamas controls every living entity. It is said that whatever we do we do in the influence of this triguni maya. But by practicing spirituality you can regulate these accordingly by developing a sound conscience and control your senses. Otherwise you will be a mere puppet in the hand of materialistic energy.