The market of wearable devices is rapidly growing, demanding advanced energy storage systems that are safe, light and customizable. The leading energy sources today are lithium-ion batteries (LIBs), and amongst those, lithium polymer batteries are the most commonly found in wearable devices. LIBs of these type can operate at > 3 V and reach an energy density 100-250 Wh kg , making them the preferred choice for energy-demanding devices, such as mobile phones and portable electronic devices. Although these batteries show several advantages, such as high energy density and lightweight design, they also come with flammability concerns and high cost. Additionally, hazardous organic solvents, such as N-Methyl-2-pyrrolidone (NMP) and organic carbonates, are employed in the manufacturing process of LIBs to cast the active materials and to dissolve the electrolyte salts. The manufacturing of lithium-ion batteries is typically based on slot-die coating under inert atmosphere, which limits the sizes and geometries available for the electrodes. The safety and flammability of LIBs, alongside the limited shape customizability, may hinder their application in next generation healthcare wearable devices. Wearable sensors typically present a power consumption in the order of ~ 0.01-1 mW, and require a nominal voltage > 1.5 V to operate, thus opening to the possibility of using alternative chemistries to lithium. Zinc ion batteries (ZIBs) can be based on aqueous electrolytes and they present a lower cradleto-gate environmental impact than LIBs in terms of CO2 emissions per kWh of energy stored. Zinc is an earth abundant element presenting a high theoretical capacity (~ 820 mAh g -1 ), with a possibly high energy density and a conveniently low redox potential (-0.76 V vs SHE) when used as anode in ZIBs. Thus ZIBs can be regarded as a possible future alternative to LIBs for wearable devices. On the other hand, the divalent nature of zinc and high charge density of zinc ions can be detrimental for the intercalation kinetic and the structural stability of cathode materials. As a consequence, there is a general demand to identify suitable cathodes for zinc-ion batteries. Several polymorphs of MnO2 (e.g. α-MnO2, γ-MnO2 and δ-MnO2) have been investigated as high-performance ZIB cathodes, owing to their low cost and high theoretical capacity. However, MnO2 cathodes are often hindered by their low rate capability and cycling stability, associated with irreversible phase transitions and large volume change during cycling. Vanadium disulfide (VS2) has been proposed as a high-performing cathode for ZIBs, owing to its layered structure with wide spacing between the layers (~ 5.76 Å), which can easily accommodate multivalent cations. The high-valence vanadium centres in VS2 promote redox reactions with fast kinetics. In contrast to other layered cathode materials (e.g. δ-MnO2, with a conductivity lower than 10 -5 S cm -1 ), the thermodynamically stable phase of VS2 has metallic character, which is beneficial for electron transfer and rate performance.