1. Volume
Rechargeable lithium-ion batteries are widely used in many new mobile devices because of their advantages of small size (relatively), light weight, low self-discharge rate and no memory effect compared with ordinary nickel-cadmium/nickel-metal hydride batteries. The batteries of mobile phones, notebook computers, PDAs and other mobile devices we usually use have been gradually replaced by lithium-ion batteries. The memory effect of nickel-metal hydride batteries is not very obvious. One point is that when you need to use it urgently, it is not necessary to discharge the light and then recharge it. It is best to discharge the light and then charge it for normal use.
2. Power
The specific energy of lithium-ion battery is large, and the battery is small; the voltage of a single lithium-ion battery is 3 times that of nickel-hydrogen battery; there is no memory effect, and it can be charged at any time. But it can't be charged at a time, so too many times of charging and discharging will affect the life of the battery. Lithium-ion batteries are not suitable for long-term storage, as they will permanently lose part of their capacity over time. It is best to store it in the freezer of the refrigerator after charging 40%.
3. Charging method
The charging requirements of lithium-ion batteries are different from those of nickel-cadmium/nickel-metal hydride batteries. The single-cell voltage of rechargeable lithium-ion batteries is 3.6V (some battery blocks may be nominally 3.7V). As the battery is fully charged, the voltage of the lithium-ion battery will gradually increase, which is also a sign to judge whether the lithium-ion battery is fully charged.
4. Energy density
The volume of nickel-metal hydride batteries is between nickel-cadmium batteries and lithium-ion batteries, which shows the transitional product properties of nickel-metal hydride batteries. Due to the different energy densities, that is, the energy that can be stored in the same volume, lithium-ion batteries are nickel-ion batteries. 3 times that of a hydrogen battery.
5. Self-discharge
Self-discharge is the amount of power that a battery loses itself when not in use. The self-discharge of nickel-hydrogen batteries and lithium-ion batteries is not large, but self-discharge of nickel-hydrogen batteries is common. Excessive self-discharge will shorten the battery life and end its life early.
