What is one characteristic of Li-Poly batteries compared to Li-ion batteries?

Li-Poly (Lithium Polymer) batteries are typically seen as more fragile compared to Li-ion (Lithium-ion) batteries due to their construction and the materials used in their design. Li-Poly batteries use a polymer electrolyte instead of a liquid electrolyte, which can make them more susceptible to physical damage or deformation. This characteristic can lead to issues such as swelling or leakage if the battery experiences mechanical stress, overcharging, or other adverse conditions.

In contrast, Li-ion batteries often come with a robust metal or hard casing, providing them with better physical protection against external impacts. This durability means they can withstand more wear and tear compared to Li-Poly batteries. Therefore, the fragility of Li-Poly batteries is a significant distinguishing feature.

The other characteristics mentioned in the options don't accurately describe the primary differences when looking specifically at the nature of Li-Poly versus Li-ion batteries. For instance, while it's true that Li-Poly batteries can be designed to be thinner and lighter than some Li-ion batteries, they do not inherently have a higher energy density. Additionally, the comparison based on weight and necessary protection does not hold as Li-Poly batteries are generally designed to be less encased, unlike Li-ion batteries which often need a protective casing. All