Lithium and alkaline batteries, the power sources for our portable devices, are compared in this guide. Lithium batteries excel in energy density and longevity, ideal for high-performance gadgets. Alkaline batteries are budget-friendly and suitable for routine, low-power tasks. Lithium is lighter, but alkaline is more economical. Responsible disposal is crucial. Safety, quality, and usage patterns determine the choice between single-use and rechargeable batteries. The decision should align with specific needs and budget, making this guide a valuable resource for informed decisions.