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Hello all of you. Today I will make a video to restore an old flashlight After a long time of use, it will be in a state like this It is in a state where the power supply is no longer available That is, the power supply in the battery will no longer be brown Or it will be poorly charged Today I will make a video to restore it Now I turn on the switch You can see that the flashlight is not bright That is, the leds are not bright To restore and repair, I will remove all the screws behind it The manufacturer has designed the screws to remove the cover And will see the details inside The manufacturer includes some circumferences And the repair part includes some batteries You will know the structure inside Usually, the inside structure is very simple It includes a manufacturing circuit and a switch this circuit is used to control the light bulb through the switch and it has another function which is to be used to charge the battery this battery is an a-shaped battery so first I will put this battery in this corner and I will measure 2 of its power supply pins with a multi-functional measuring clock I will measure for you to see what the condition of this battery is I will measure it for you to see, it drops to about 1.9V, that is, the battery is weak and fragile. This led needs to use a minimum power source of about 3.8V, so it is bright, guys. The battery has been used for many years, so it is no longer able to be stored or stored poorly. At the top of it, there will be a cover to pour water or acid. Here, there will be 2 covers made of rubber here. I will remove these 2 covers and I will pour more water for it, guys. The water is here, I already have it here. You can use rainwater or water to add more acid to the motorbike. I will soak it to make it a little full. I will wait about 15 to 20 minutes for it to soak up all the water on this surface and I will take a dry cloth. Now I will wait about 15 minutes more, guys. After about 15 minutes, the water has soaked into this pin-acid-g. I will take the cover, put the rubber on it, I will put it in. I will take the plastic cover to keep the 2 rubber covers from coming out. I will cover the pin-acid-g to the battery. I will cover it like a cover. Then I will charge it. I will plug in the battery and charge it, guys. While covering it like this, you will pay attention to this part of the cover. There will be some wires running around, guys. You will slide it in to clip it in. Avoid the situation that when we cover it, the pin-acid-g sticks to the wire, it breaks the wire, guys. So you need to be careful. I will put all the screws in here, guys. Then I will charge it. The charging time here is about 7 to 8 hours or 10 hours. I will wait until about 10 o'clock. After about 10 hours, I will take this flashlight out and I will try it for you to see. I will turn on the power switch to see if this flashlight is bright or not. Wait a minute. I will turn on the power switch. After I turned on the power switch, this led was bright. I will turn on the back light. Now I will turn off the light. I will turn off the backlight. The brightness is very stable, guys. That's how we can use this flashlight.