Childhood toys often featured bright lights, loud noises, and disappointment when you realized you forgot the batteries. Lithium-ion batteries got rid of the “batteries not included” madness that destroyed Christmas mornings and birthdays. With these included and long-lasting, rechargeable batteries consumer electronics have leaped forward with portability, powering mobile phones and laptops allowing us to remain constantly connected, far away from power outlets. All that with no AA or AAA to keep track of.