Handy Geng's 27,000,000 mAh battery bank might just be the largest 'portable' charger in the world. Featuring 60 mains power sockets on one side, it can charge a regular smartphone up to 5000 times, or as Geng's YouTube video shows, power some entertainment and household appliances while enjoying a little nature.
In a video uploaded on January 29th, Geng, dubbed "China's Useless Edison," shows the build process of turning a battery bank designed for electric vehicles into a comically large power bank modeled on the style of his regular charger.
Handy Geng is no stranger to large-scale projects, and his completely recycled electric car https://www.youtube.com/watch?v=iBz6voaxh2Q build from last year has garnered over 10 million views on YouTube. Perhaps a more nostalgic build to those of a certain age (Mechwarrior anyone?) is this DIY ridable security mech:
While it seems unlikely a power bank larger than many people's bathrooms will come to the market any time soon, it's nice to know that the batteries powering our vehicles are usable in large-scale DIY projects, even if the battery protection circuitry might be a bit beefier than your average 18650 project might require!