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3S Battery. BMS . Battery pack. #diy #electronic #testing

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DIY 3S Lithium Battery Variable Power Supply with BMS and XL4015 Module | BMS Sleep Mode Fix In this video, I built a DIY portable variable power supply using three 18650 lithium-ion batteries, a 3S BMS protection board, and an XL4015 adjustable DC-DC buck converter module with a dual LED display. This homemade power supply is useful for testing electronic circuits, radio projects, and other DIY electronics projects. Components Used: 1. 3S 12.6V 1A Lithium Battery Charger Module (Type-C) – Purchased from Robu for ₹119. It is designed to charge a 3S lithium-ion battery pack with a maximum charging voltage of 12.6V. 2. 3S BMS Protection Board – Provides battery protection against conditions such as overcharging, over-discharging, and overcurrent, depending on the specific BMS model. 3. XL4015 5A Adjustable Buck Converter Module with Dual LED Display – Purchased from Robu for ₹649. It allows adjustable output voltage and current limiting, with a display for monitoring voltage and current. BMS Sleep Mode Problem and Solution: When I first connected the battery pack, the BMS had no output. I discovered that the protection board was not providing output because it was in a sleep or protection state. I connected the 3S battery charging module and applied a charge for a few seconds. After that, the BMS started providing output. Building the Variable Power Supply: After activating the BMS, I connected its output to the XL4015 adjustable buck converter. Now, I can adjust the output voltage according to the requirements of my electronic projects. I originally purchased the XL4015 module for charging lead-acid batteries, but I found it useful for building this portable bench power supply. Although the display responds a little slowly, it works well for my applications. This project is a practical way to build an adjustable power supply for DIY electronics, circuit testing, radio experiments, and other low-voltage applications. Important: The XL4015 is a step-down converter, so its output voltage cannot exceed its input voltage. The actual output current also depends on the battery pack, BMS, wiring, cooling, and converter limitations. Use a suitable 3S charger and properly matched 18650 cells. If you enjoyed this project, please LIKE, SHARE, and SUBSCRIBE to Electric Dhamaka for more DIY electronics projects, practical circuit experiments, and useful repair tutorials. #DIYPowerSupply #XL4015 #18650Battery #3SBMS #VariablePowerSupply #DIYElectronics #BenchPowerSupply #ElectricDhamaka

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