Power bank for 3x AA rechargeable batteries
thingiverse
Power Bank USB Revolution: Turning Discarded Batteries into a Portable Powerhouse Watch the mind-blowing tutorial on YouTube here: https://www.youtube.com/watch?v=XjFHw88ekHk You can transform three ordinary AA batteries, each with a capacity of 2100 mAh, into a high-performance power bank. The type and capacity of these batteries don't matter - what's essential is having exactly three pieces. To achieve this incredible feat, use a DC-DC step-up converter module that boosts voltage from 0.9V to 5V. Find this game-changing module on Aliexpress here: 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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