Battery Charging Board, Power Charger Board Module Boost Converter Step UP Module 5V 2A UPS Power Supply 18650 Battery

hey guys let's assume you have dismantled the battery pack of a failed laptop like I did in the video above the result is lots of lithium iron 18 650 cells but before we use them we have to make sure that they are in usable condition this means that the voltage should never be below three walls and the voltages of all your cells should be approximately the same maybe you also have a small DIY solar power system like me the energy is stored inside a small LED acid battery and there are two USB charging outputs but what if you want to store more energy which allows you to charge your USB captured during the night well in this case a USB power bank comes in handy it consists of a micro USB charging input and the five volt 1 amp USB output the USB output module can be switched on and off 50 switch for lithium ion 18 650 cells or riot in parallel so let's go and build a power bank like this