The most common types of battery packs include lithium-ion, nickel-metal hydride (NiMH), and lead-acid batteries, each with distinct characteristics that make them suitable for different uses. . A battery pack is essentially a collection of batteries designed to power various devices and applications. They typically consist of multiple battery cells grouped together, allowing them to deliver a higher voltage or capacity than a single cell. From electric vehicles to portable electronics, the significance of battery packs cannot. . The first thing you need to know is that there are three primary ways to successfully connect batteries: The first is via a series connection, the second is called a parallel connection, and the third option is a combination of the two called a series-parallel connection. Once depleted, they cannot be recharged and must be disposed of properly.