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Power bank for 3x AA rechargeable batteries

Power bank for 3x AA rechargeable batteries

thingiverse

Power bank USB https://www.youtube.com/watch?v=XjFHw88ekHk Used batteries are 3 pieces of AA 2100 mAh. The capacity doesnt matters. Only 3 pieces and type. Used this step-up convertor: DC-DC-Converter-Step-Up-Boost-Module-0.9 to 5V https://www.aliexpress.com/wholesale?ltype=wholesale&d=y&origin=y&isViewCP=y&catId=0&initiative_id=SB_20170617020600&SearchText=DC-DC+Step-Up+Boost+Module+0.9V+to+5V&blanktest=0&tc=af

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