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A group of voltaic cells connected in series.
The main parameters considered when selecting batteries:
A battery with electrodes of lead oxide and metallic lead that are separated by an electrolyte of sulphuric acid.
Energy density: 25 Watt-hours/kg up to 50 Watt-hours/kg for the very latest designs.
This type of battery uses metalic lithium as the anode, lithium ions are added to a carbon electrode.
A battery with a lithium anode that is separated from the cathode by a thin polymer electrolyte.
Energy density: 80-135 Watt-hours/kg
The battery has a nickel-hydroxide cathode, a cadmium anode, and aqueous potassium hydroxide electrolyte.
The battery has a nickel-hydroxide cathode, a metal hydride (a variety of metal alloys are used) anode, and aqueous potassium hydroxide electrolyte.
Energy density: 80-135 Watt-hours/kg