Lithium-ion capacitor

Lithium-ion capacitors are special kinds of batteries that use a combination of lithium-ion and electric-double-layer technologies to store energy. They are similar to regular batteries in that you can use them to power devices, like phones and computers. The difference is that lithium-ion capacitors are better at storing energy for short periods of time than regular batteries. That's why they're useful for things like flashlights, which need to quickly turn on and off. Lithium-ion capacitors are also lighter than regular batteries, so they're good when you need to save a lot of space and weight.