With a focus on portability, lightweight battery packs have been specially designed. Due to its energy-to-weight ratio, lithium-ion technology is frequently utilized. Lightweight plastics and compact battery cells are used in the construction of these packs. For those looking to travel and needing to charge devices on-the-go without the added weight, these packs are perfect. Additionally, for powering smaller devices like Bluetooth earphones and fitness trackers, many of these packs are capable of charging smartphones multiple times.