This DIY power bank project from Do It Yourself Gadgets uses recycled laptop battery and a 5V boost converter to construct an USB charger.
DIY power bank using laptop battery
This article will show you the basic powerbank circuit consisting of Lithium cell charging circuit, boost converter and toggle switch as well as my improved version with self activating boost converter and LED status indicator and homemade housing. It all started with an old Lenovo laptop battery. I carefully pried it open to examine the cells. Three packs of two parallel 18650 Lithium 2200 mAh cells were connected in series.
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