Lithium batteries are a type of rechargeable batteries that use graphite or other carbon materials as the negative electrode and lithium-containing compounds as the positive electrode. It is a type of battery that uses lithium metal or lithium alloy as the positive/negative electrode material and uses a non-aqueous electrolyte solution.

　　The voltage of a single nickel-hydrogen battery is 1.2V, and the voltage of a single lithium battery is 3.7V. From the voltage analysis, the discharge platform of lithium batteries is higher than that of nickel-hydrogen batteries. In the application of digital electronic products, the number of lithium batteries used for the same voltage is significantly less than that of nickel-hydrogen batteries several times, which saves the space of the product battery compartment and also reduces the weight of the product.

　　Rechargeable batteries, also called secondary batteries, are batteries that can be recharged and discharged. Early mobile phones were all nickel-metal hydride batteries. One major problem with nickel-metal hydride batteries was the memory effect. In the early days, mobile phones would remind buyers that the first charge should be more than 12 hours, otherwise the battery will not be charged in the future. Lithium battery is a general term for lithium-ion battery and lithium metal battery. Later, Japan developed lithium-ion batteries. Compared with nickel-hydrogen batteries, the advantages are large capacity, no memory effect, thinner batteries, and high voltage. Nowadays, the application of lithium metal batteries is relatively small, mainly because of its safety issues.

　　The safety of batteries is really important day by day. Battery explosions happen frequently. Although single nickel-metal hydride batteries rarely have such incidents, if manufacturers can conduct strict inspections before shipment, they can definitely reduce the frequency of occurrences.