Sunny Buddy Solar Charger V13 Hookup Guide by SparkFun Electronics Datasheet | DigiKey
SparkFun LiPo Charger/Booster - 5V/1A , from Sparkfun for €14.82
Battery Babysitter Hookup Guide - SparkFun Learn
Brett.io on X: "Not proud of the aesthetics but it's just for testing. Reworking @sparkfun's Sunny Buddy solar battery charger to accommodate a 3S li-ion. Left resistors raises float voltage, right resistors