It is very frustrating when the flashlight is darker in emergency because its battery is used up. Even modern LED flashlight needs several hours for full charge and has short cycle life of battery.
The flashlight using supercapacitor instead of battery as the energy storage unit just costs dozens of seconds for charging and has cycle life of 500,000 times. The flashlight has many specific users, such as policeman and army.

• Pervous：Portable Defibrillator ◆ Consumer Electronics
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