What is the difference between various common rechargeable batteries?

At present, nickel-cadmium, nickel-metal hydride, and lithium-ion Rechargeable Alkaline battery are widely used in various portable electrical equipment (such as notebook computers, cameras and mobile phones). Each rechargeable battery has its own unique chemical properties. The main difference between nickel-cadmium and nickel-metal hydride batteries is that the energy density of nickel-metal hydride batteries is relatively high. Compared with batteries of the same type, the capacity of Ni-MH batteries is twice that of Ni-Cd batteries. This means that the use of nickel-metal hydride batteries can greatly extend the working time of the equipment when no additional weight is added to the electrical equipment. Another advantage of nickel-hydrogen batteries is that it greatly reduces the "memory effect" problems in cadmium batteries, which makes it more convenient to use nickel-hydrogen batteries. Ni-MH batteries are more environmentally friendly than Ni-Cd batteries because there are no toxic heavy metal elements inside.
Li-ion has also quickly become a standard power source for portable devices. Li-ion can provide the same energy as Ni-MH batteries, but can be reduced by about 35% in terms of weight. This is good for electrical equipment such as cameras and laptops. It’s crucial. The advantage that Li-ion has no "memory effect" and no toxic substances are also important factors that make it a standard power source.