24 Cell 18650 DIY USB Powerbank With Apple Watch & QI Charging (Vruzend Compatible)

thingiverse

I, like many of you, have accumulated numerous USB power banks, but even my largest, a 20,000mah pack, died after only a few days away camping while charging my Apple Watch and iPhone. I needed something that would last much longer and be more versatile at the same time. As we live in the 21st century, we can harness the expertise of others through online guides on how to DIY the battery side of things. Following these instructions, I designed this enclosure around a pack with some added features too! The enclosure contains all the necessary holes for an on/off button, a charger port, a LCD battery level indicator, and 4x USB ports. All those additional hardware items are linked below. So, you want one too? To actually build the power banks' electronics, I used this guide: https://www.instructables.com/id/DIY-Professional-18650-Battery-Pack/. I suggest you follow that, assemble your pack, ensure it works, and then order all the required parts for this enclosure. This is a total ground-up re-design of my previous project "https://www.thingiverse.com/thing:3538397" to maintain the same benefits as before with some minor improvements in spacing and sizing, but be compatible with the Vruzend 1.6 battery system. This kit allows you to literally clip and bolt together a battery pack, making it possible for anyone to create their own 18650 power bank without needing a spot welder. Performance In my combination of recycled 2500-3000mAh cells from old laptop battery packs that I dismantled, I achieved a total capacity of 38,000mah. This was tested using a 2amp dummy load and a USB power analyzer in-line. Using higher (such as all 3000mAh) or lower capacity cells would result in different capacity numbers, and drawing current in smaller bursts, giving the cells time to recover slightly, would likely have yielded over 40,000mah. I created two wiring diagrams: the first is a simple block-type wiring diagram, and the second is a more visual diagram. I know it may look difficult, but trust me, just add wires one at a time, and you'll soon figure it out – it's very easy in all honesty.