Gregor wrote an instructable detailing the build of his Automatic 18650 Analyzer project:
The idea behind this project was to create a cost effective device that could automatically charge and discharge multiple 18650 cells while determining the effective capacity of each individual cell. Individual cells can be binned by capacity, so multiple parallel packs with identical capacity can be put in series.
This Instructable will outline my complete design process including, specification development, component selection, circuit design/pcb layout, assembly, and software.
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