Introduction: Power Bank!
Homemade Emergency Device, Make - DIY - Cheap - Portable USB Energy Power Backup Generator. Lets Charge using a DC Hand Crank - Dynamo or Sun with Solar Cell or your 220v AC mobile charger. This little & Amazing Device is very Effective and Practical. Here we have three different ways to charge the Battery Bank! Emergency Power Supply for Home - Camping or Urban Emergencies...
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