2. Self-discharge: Self-discharge refers to the power that the battery will lose by itself when it is 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. Therefore, about a decade ago, low self-discharge Ni-MH batteries used to be a bright spot in the promotion of Ni-MH batteries, while the self-discharge of Li-ion batteries was negligible, which is a natural difference in chemical properties caused by the raw materials used in the two.
3. No memory effect: Ni-MH battery has obvious memory effect. Human memory is the impression left in the brain, and the same is true for nickel-metal hydride batteries. If the discharge is incomplete or the charging is not satisfied, the battery will only remember the incomplete and unsatisfactory state after a long time. The performance of the application is the capacity attenuation. Lithium-ion batteries do not have this feature. Therefore, the nickel-metal hydride battery should be thoroughly discharged every once in a while to clear the memory left behind, which is similar to brainwashing people. Lithium-ion batteries can be charged and used at any time, so lithium-ion batteries are a happy battery, and our users are also happy.
4. The charging and discharging platform is high. The voltage of a single lithium-ion battery is 3.6V, and the voltage of a single nickel-metal hydride battery is 1.2V, and the former is 3 times that of the latter. The lithium-ion battery charging method is to set a termination voltage, usually a single 2.5V, and the nickel-metal hydride battery has no voltage rise and fall. The charging method of lithium-ion batteries is called voltage-limiting and current-limiting method (pressure refers to voltage, current refers to current, that is, to set an upper and lower limit for voltage and current) charging, while nickel-metal hydride batteries have a low voltage platform, usually using constant current (a constant current) to charge. Due to the different charging methods, lithium-ion battery chargers and NiMH battery chargers cannot be mixed.
5. Specific specifications. The market often hears the name of special-shaped nickel-metal hydride batteries, but rarely hears special-shaped lithium-ion batteries. This is because lithium-ion batteries are currently mainly used in products with large market capacity. If it is applied to a market with small capacity, it is not only a technology, but also a problem of large cost allocation.