The Power Bank 18000mAh power has multiple voltage outputs. It is emergency power backup. Use it for LED lighting, car jump start, laptop power, charging phones when the power goes out. The unit comes with a convenient zippered case and cables.
Periodic Table position and atomic weight.
Simply, lithium batteries contain a cathode, an anode and electrolyte. Lithium being very light - number 3 on the periodic scale - makes it ideal for portable devices like our smart phones.