buy a 12v-5v usb module? I do have some LM7805s but no capacitors. 2. What's the easiest way to measure current draw to the battery? I've considered a shunt, and have a clamp sensor, but it's not hall-effect and doesn't appear to work with a multiplex device (several analogu...
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18650 cells, which are used in many different consumer electronics from laptops to power tools, are one of the most common battery cells employed in electric bicycle battery packs. For many years there were only mediocre 18650 cells available, but the demand by power tool makers and even some ...