Let's build a power bank today in just 300bux or just 4 dollars. yes, you can build it by yourself.   If you are a techie like me, it is better to build your own power bank instead of buying it. It will make you feel happy and you'll end up saving some money.                                                                         - Apurv Patil.    Caution:  If your not good at soldering it is better if you do it under someone's guidance. All the best do it safely,     Apparatus:     (I have mentioned best buyer's links as well.)   1. Old laptop battery.   2. Soldering iron and wire.   3. DIY charging board.   4. D...
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