History of Power Banks and Lithium batteries
When was the first call of a mobile phone?
Martin Cooper, manager of Motorola, made a call to, Joel Engel, of Bell Labs of AT&TE on April 3, 1973, from Sixth Avenue in New York, with a prototype of Motorola DynaTac 8000X. That was a mobile phone that weighed approximately one kilo and was about 13 inches (33 cm) tall taking into account the antenna. It was the first call made from a mobile phone.
This prototype mobile phone used about ten hours to charge. Its battery had a range of just 30 minutes. Something that today is absolutely unthinkable