Bee batteries are a type of renewable energy source that uses the power of bees to generate electricity. The term 'bee batteries' is derived from the fact that bees can be used to create a form of electrical current, similar to how a battery works. The crossword solution for the term 'bee batteries' is 'STINGS', referring to the fact that bees use their stingers to create an electrical current. Bee batteries are a relatively new form of renewable energy, and are being explored as a potential alternative to traditional sources of energy.