COMPATIBLE With most Micro USB smartphone brands HANDY SOLUTION For convenient charging, anywhere PORTABLE DESIGN Sleek exterior with built-in cable solution 6,700mAh Compact, convenient charging ALWAYS ON Just plug & charge SMART CIRCUIT SYSTEM For surge protection
In 1802, William Cruickshank designed the first electric battery for mass production. He arranged square sheets of copper with equal-sized sheets of zinc placed into a long rectangular wooden box and soldered together. Grooves in the box held the metal plates in position. The sealed box was then filled with an electrolyte of brine, or watered-down acid. This resembled the flooded battery that is still with us today.