Nickel-metal hydride cells operate at an average of 1.2 volts. Lithium cells operate at voltages in the 3.0-volt range. Both types of cells are designed to last for around three years, providing up to around 500 discharge cycles before they become ineffective.
Perhaps the biggest difference between these types of batteries is the components that go into their construction. Lithium batteries utilize lithium metal in the construction of their anode. Nickel-metal hydride batteries utilize hydrogen in the construction of their anode.
A nickel metal hydride cell loses up to 5 percent of its charge daily in storage. Storing both types of cells in high-temperature environments reduces service life, which is why they should be stored in cool environments. Lithium cells need to be stored in fireproof containers away from combustible materials because they can catch fire easily, producing an exceptionally hot fire.