37V To 9V 5V 2A DC-DC Step Up Boost Module 18650 Lithium Battery Charging Discharging Board Type-C DC Booster Converter Module _x000D_ Features: 1. Ultra thin ultra mini design, small half hole screw hole, selected materials 2. Ultra small lithium battery charging boost module with excellent performance 3. The output voltage with boost voltage is adjustable 4. Constant current, constant voltage charging, with over temperature protection 5. Charging state dual output, no battery and fault state display Parameters: Operating temperature - 40~80 Input voltage range 4.2V~6.5V Output voltage 4.2V-28V adjustable Maximum power 5W It can be activated at 0V and charged at 2.9V trickle Up to 1A programmable linear charging current Used for single 3.7V lithium battery, fully charged with 4.2V Constant current/constant voltage charging with over temperature protection Soft start limit surge current, with battery reverse connection protection Low power consumption standby, extending battery life Charge state dual output, no battery and fault state display Description of charging indicator: The module can roughly judge the working state by two LED and other states. The CHRG light is red, and the STDBY light is blue. When the battery is charged, the red light is bright, but the blue light is not bright. When the battery is full, the blue light is bright, and the red light is slightly bright. If there is a boost output, according to the different output power, it is possible that the red light will always be bright for charging. When no load is connected, the blue light will be on, and the red light will be slightly on. Instructions: The module supports type-c interface input and solder joint input marked with input on the back. Select one of them, and the recommended voltage is about 5V. The module is marked with two outputs. The two outputs are the same, and the lines are in parallel. You can choose one of them by yourself. How to connect the battery: If your battery has its own protective plate, you can choose products without discharge protection. After connecting B+and B -, you must short circuit T point to charge and discharge the battery. If your battery does not have a protective plate, you should choose a product with discharge protection. This is very important, because over discharge of the battery is likely to cause the battery to be scrapped. Most competitive products do not have discharge protection. After the battery is connected to B+and B -, it is not allowed to short circuit the T point, otherwise the discharge protection will become invalid. After wiring, you can adjust the output voltage you want with a screwdriver. The battery is 3.7V lithium battery with a full charge voltage of 4.2V. The battery type can be 18650 or polymer battery. Instructions *The product is charged linearly, the heating is normal, and you can use it with confidence *Batteries can only be connected in parallel, not in series. *The charging current should be 0.37C of the battery capacity, which is 0.37 times of the capacity. For example, the charging current of the battery of 1000mAH is 400, which is enough. *The charging connection wire shall not be too thin or too long. In this way, the connection resistance is high. If it is too small, the battery voltage will drop more after flushing. *It is better to have good contact with the battery. Otherwise, the battery voltage will drop more after flushing. *The heating is normal when the current is high during the boost operation. The higher the current is, the hotter it is. This is a normal phenomenon. The chip is provided with overheating protection, which can be used with confidence. Package include: Booster module X1 _x000D_