Battery, battery pack, and uninterruptible power supply

A battery comprising a cathode having a composite cathode material and a cathode current collector, an anode having an anode active substance and an anode current collector, and an electrolyte solution having first and second metal ions, further comprising:

• the composite cathode material comprising a coating layer and a cathode active substance;
• the coating layer comprising lead having a mass ratio of lead no greater than 1000 ppm;
• and
• the cathode active substance comprises a modified lithium manganese oxide material having a general formula Li1+xMnyPbzOk, wherein −1<x≤0.5, 1≤y≤2.5, 0<z≤0.1, and 3≤k≤6;
• and
• wherein the first metal ions is selected from Lithium, Sodium, and Magnesium, and are reduced and deposited as a first metal at the anode, and the first metal is oxidized and dissolved back to the first metal ions, in a charging/discharging process;
• and
• wherein the second metal ions is Zinc, and are reversibly deintercalated-intercalated at the cathode in the charging/discharging process.