use a dc power source. preferably an ac/dc power adapter. any dc power source will do.

What kind of question is this? If I have a button cell, then a 15000 microfarad 16v capacitor will obviously be heavier, and a 1 microfarad 50v capacitor will weigh less than an AA battery, which will be lighter than a high voltage supercapacitor.

If you need a device with high power characteristics and a certain amount of energy to drive electrical appliances, long-term maintenance-free, and use in a wide temperature range, especially when the safety requirements are relatively strict at minus 30 to 40 degrees, supercapacitor should be a suitable choice.

You may find super capacitors in the following applications:

Instant high power, such as UAV ejection device;

Short-term current supply, such as police flashlights;

Conditions of frequent acceleration (downward) and deceleration (upward), such as braking energy recovery device;

Diesel vehicles are started in extreme cold weather or in the state of battery failure;

Backup power supply for wind power generation, solar thermal power generation, nuclear power and other power generation terminals;

All kinds of long-life, high-reliability, maintenance-free, high-power density backup power supplies

----We're JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.), an electronic components manufacturer. You may google search "JYH HSU" to find our official website.

Super capacitor have high capacitance compare to normal capacitor. Super capacitor use two layer of dielectric medium whereas in normal capacitor single medium dielectric.

Because of this super capacitor use as alternate power source for RTC when computer is off.