For portable operation, what is the primary advantage of lithium-based batteries over lead-acid batteries?

Lithium-based batteries have an exceptionally high energy density, meaning they can store a massive amount of electrical energy relative to their physical weight. This high capacity per kilogram makes them the top choice for portable amateur radio operations, such as backpacking or field days, where minimizing gear weight is essential. Lead-acid batteries are reliable but extremely heavy due to their dense lead plates. It is important to note that lithium batteries are sensitive and require strict, specialized charging protocols to prevent overheating or fire. Therefore, distractors suggesting they have 'simple charging methods' or 'high tolerance to overcharge' are completely incorrect.