Diy lithium-ion battery charger its sop package and low external component count makes tp4056 ideal for diy applications. it can work with usb as well as wall. Instructables has a step-by-step for building your very own altoids tin usb charger (dubbed the mintyboost).. In this tutorial we take some old rechargeable li-ion batteries and make a homemade usb emergency charger out of them. for converting the 3-4 volts from.
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