Cheap stand alone power solutions

Works like a charm, charges fast with the 14.5v the car alternator puts out. Use car running time (regular) to charge this as well as usb powerbanks with a simple 2amp converter available at the dollar store

All protocols and diy solutions on this substack are free, however donations are appreciated at my paypal dr.grouf@gmail.com

For a collection of diy pdf file send $5 to the above paypal,write diy and your email in notes, so I can email the file