Most people think that a power supply is the same as a battery. While they are both used to provide power to devices, there are some key differences between the two. A power supply is typically used to provide power to an AC or DC load. A battery, on the other hand, is primarily used to store energy. Power supplies can be. Batteries are made up of a number of cells connected together in series. Each cell has two electrodes, a positive cathode, and a negative anode,. Batteries are a type of power supply that stores energy in chemical form and convert it to electrical energy when needed. They are often. When it comes to battery technology, there are many different types and styles out there. But one that is becoming increasingly popular in recent years is the modular battery. A modular battery system is a type of energy storage system that uses multiple individual batteries, known as modules, to store and discharge.