In summary, the designer will opt for some type of energy storage element (capacitor, supercapacitor, or battery), depending on the required backup time and application specifics. A good generalization for usage is batteries are good for long run time, at low to medium power, SuperCapacitors are good for short run time, at medium to high power, and electrolytic capacitors are good for very short run time, and are high temperature capable. The LTC3643 offers an excellent high voltage, high current charging and backup solution utilizing electrolytic capacitors as the storage element.