Is there a capacitor in Lin Yue battery protector?

No. Capacitors are used to store electric energy and filter in the circuit, and the main function of battery protector is to protect the battery from overcharge, overdischarge or other damage. Although the capacitor can be used to improve the performance of the battery in some cases, such as increasing the charge and discharge rate of the battery, it is not the main component of the battery protector. Therefore, Lin Yue battery protector does not use capacitors.