Final answer:
Rechargeable batteries are electrodes that can switch their charges back and forth through reversible electrode reactions.
Step-by-step explanation:
The question is referring to electrodes that can switch their charges back and forth. This behavior is commonly seen in rechargeable batteries, also known as secondary batteries. Rechargeable batteries have electrodes that undergo reversible electrode reactions, allowing them to be recharged by applying an electrical potential in the reverse direction. This process converts the battery from a galvanic cell to an electrolytic cell temporarily.