The so-called Lithium-Ion batteries belong to the group of secondary or rechargeable batteries. With graphite anode and cobalt oxide cathode, trifiline (LiFePO4) or manganese oxide. They barely suffer memory effect and achieve high power densities (115 Wh/kg). These batteries can be charged even without being fully discharged and without reducing their service life. They do not tolerate complete discharges or high working temperatures.