Zn-ion batteries (ZIBs) are becoming more common devices to store energy for a variety of electronic gadgets due to their large scale, cheap cost, ample resources, elevated protection, and environmental approachability. To sustain the cumulative popularity of transportable and wearable electronic gadgets, it is important to foster modern, elastic power reserves. The quest for different types of sophisticated batteries like ZIBs has been sparked by the ever-increasing need for electrical storage of energy. Developing acceptable cathode materials for Zn-ion intercalation, on the other hand, remains a significant difficulty. In the last few years, a lot of work has gone into designing versatile ZIBs. The recent advances in the design, fabrication, mechanisms for storing zinc ions, cathode materials, and characterization of flexible ZIBs, applications of ZIBs, and much more are summarized in this chapter. The new electrolyte and electrode architecture, which seeks to provide reliable flexibility to the manufactured ZIBs, and classification of the materials for cathodes used for the fabrication of aqueous ZIBs into four different categories: cathodes based on vanadium, Prussian blue analogs, manganese-based cathodes, and organic derivatives, is given special attention. Furthermore, perspectives on current ZIB problems and future outlook are given, as well as suggestions about potential prospects for creating high-performance scalable ZIBs.