The super capacitor used to start the car usually consists of six 15V start-up modules. And super capacitors typically exceed 2.7V, which can cause electrolyte leakage and damage the capacitor. But our 2.5V supercapacitors will help avoid those problems and present a better performance. Moreover, before shipping, we would run welding test to make sure high-quality product for all of our clients. Features: 2.5V Super Farad Capacitor - Suitable for super capacitor protection board Each capacitor is equipped with a protective plate that effectively protects each capacitor from exceeding the limiting voltage. The power tube and the large copper on the back of the resistor improve heat dissipation and operate more stably. High-power switch, 3hree 2010 SMD resistors connected in parallel to a 0.4 ohm resistor (considering the heating problem, the continuous voltage limit should not exceed 1A current). Using a high-precision regulator IC as a reference, the default regulator is 2.5v±50mV (adjustable R4, R5 resistors adjust the pressure limit size) The diameter is 35mm, the fixing hole diameter is 5.8mm, the center distance of the two holes is 12.5mm, and the pad diameter is 10mm. (in accordance with 600- 700F super capacitors) The diameter is 40mm, the diameter of the fixing hole is 6mm, the center distance between the two holes is 17mm, and the pad diameter is 10mm. (in accordance with 2000F supercapacitors) Specification: Type: Super Farad Capacitor Weight: Approx. 32g Package list: 6 * Pcs of Super Farad Capacitor Note: Please allow slight error due to manual measurement. Thanks for your kind understanding.