3.7V 1000mah, energy is 3.7Wh. If powered at full power on a 3W LED, the theoretical time is only 1.2 hours, but this also implies the efficiency of the drive circuit and whether it is powered constantly. In actual use, duration may vary significantly. If the battery voltage drops while driving and the LED terminal current decreases, it may stay on for more than 2 hours or even longer. The key lies in the way you drive and how efficiently you drive. the driving circuit
Is the lithium battery in the flashlight dangerous?
The lithium battery protection plate is used to prevent the lithium battery from be overcharged or discharged and plays a corresponding protective role.
Overcharge protection: Lithium batteries cannot be charged indefinitely when they reach a certain level, they explode or even explode, cwhich is quite dangerous. Therefore, there must be overload protection. Around 4.35V, the protection board will automatically cut off the load and there will be no risk of overcharging.
Over-discharge protection: The inside of the lithium battery is made up of various chemical components. It requires a certain voltage so that the chemical components inside the battery do not lose their activity. battery voltage exceeds When the voltage is low, the chemical components inside the battery will become ineffective. Even if you recharge it later, most of the chemicals inside the battery will also be ineffective. the battery voltage drops to about 2.4V, the protection board will be protected and it cannot discharge at this time.
Short circuit protection: if the positive and negative poles of the lithium battery are shortrt-circuited, it's a terrible thing. The current can exceed 3A in an instant. For example, it can burn. piece of red-hot iron in an instant. It's like roasted pig's trotters on your hands, and you're guaranteed to smell the meaty aroma. And if the time increases, the battery will explode. This is the principle of short circuit protection. When the positive and negative poles are short-circuited by metal objects and the current exceeds 3A, it can be turned off in a short time to prevent the battery from being discharged, so that there is a short circuit . there is no danger.
With a protection plate, the battery itself can be well protected. Without it, on the one hand, the battery itself will be easily damaged, and on the other hand, there will be safety risks.
Of course, if you do not use a protective plate, because the internal resistance is smaller, the use life may be a little longer.had longer and the price will be cheaper, but personally, safety comes first.
Generally, current cell phone batteries are lithium batteries. As we all know, lithium battery material is a very active chemical metal because its activity is stronger than hydrogen, that is, it is very metallic. So it is very easy to spontaneously ignite when it encounters water, which is very dangerous. Air contains a lot of water vapor, so it is very easy to catch fire when the lithium battery is exposed to air. Therefore, you cannot disassemble it. cell phone battery without permission. An explosion of the lithium battery will cause the cell phone to explode. If you're too close to a cell phone, there's a good chance you'll be disfigured! However, lithium batteries are also often used to solve the problem of makingfire in nature!