Which of the following is not a characteristic of lithium-ion batteries?

• A. High energy density
• B. Lightweight
• C. Good cycle life
• D. Low power-to-weight ratio

Answer: (D)

Lithium-ion batteries are prized for storing a lot of energy in a light package, which is why they’re so common in electric vehicles and portable devices. Their high energy density means you get more energy per unit of weight, so the overall pack can be lighter for the same range. That same property also makes them a good choice for applications where weight matters, contributing to better performance and efficiency.

They also tend to have a good cycle life, meaning they can endure many charge-discharge cycles before their capacity degrades significantly, especially with proper usage and thermal management. And because they store a lot of energy for their mass, they deliver power without adding a lot of weight, giving them a strong power-to-weight ratio.

The statement about a low power-to-weight ratio doesn’t fit, because lithium-ion chemistry typically provides substantial power relative to its weight. While power delivery can be influenced by design and safety limits, the overall tendency is high power density compared with many other rechargeable chemistries.