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In today's video tutorial, the focus is on creating a portable USB charger using two 9-volt batteries and a USB car charger. Essential parts include a switch and copper wires for connections. The batteries should be connected in series via the switch, following the plus and minus pole markings. It is recommended to repurpose old toys for battery terminals if needed. The entire setup can be housed in any box of choice. This DIY project provides a convenient solution for charging phones, tablets, or cameras while outdoors.