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Lithium ion batteries

Advantages: There is no memory effect (referring to the phenomenon that if the battery is a nickel cadmium battery, if it is not charged or discharged for a long time, it is easy to leave traces inside the battery and reduce the battery capacity. Another explanation is that the battery seems to remember the user's daily charging and discharging amplitude and mode, and it is difficult to change this mode over time, and cannot be charged or discharged significantly again), and it is lightweight.

Disadvantages: High cost, low current flow, and inability to withstand overcharging (compared to nickel hydrogen batteries).

Nickel hydrogen battery

Advantages: Cheap price, strong versatility, large current flow, environmentally friendly and pollution-free, and good stability.

Defects: Heavy weight and short battery life.

Comparison of charging modes

The design of nickel hydrogen battery chargers and lithium battery chargers is based on voltage in principle, and the charging methods for designs with or without memory effects are also different.

In terms of voltage, the charging termination voltage of nickel hydrogen battery chargers is generally set to 1.4V. Some chargers can also extend up or down a bit. Depending on the condition of the battery, if the battery discharge is below 1.1V, there is a possibility that it cannot be charged. The highest 1.4V is the upper limit that cannot be exceeded under normal circumstances. For nickel hydrogen batteries, discharging at 1.1V is not very meaningful because capacity replenishment cannot be obtained during charging. Lithium ion battery chargers are generally produced one-on-one, which means that a single lithium-ion battery is designed with a rated voltage of 3.6V~3.7V and a charging termination voltage of 4.1V~4.2V. The voltage of the lithium-ion battery pack design is not very similar for different series and parallel situations.

In use, due to the different internal structures of lithium-ion batteries and nickel hydrogen batteries, the composition material of lithium-ion batteries is active substances, so there is no memory effect. Overcharging should be avoided. And nickel hydrogen batteries are different. After a certain period of cycling, the electrolyte will crystallize, preventing the charger from fully charging, which is why the memory effect begins to take effect. The correct approach is to activate, which can be divided into two types: one is complete charging and discharging without loss of capacity, and the second is to activate the nickel hydrogen battery with 1.5 times the charging time if the capacity loss exceeds 1/10, which is almost unusable. In this case, the internal crystalline material can be activated to restart the nickel hydrogen battery. Correspondingly, the charging process is also accompanied by an increase in voltage, The termination voltage design of the nickel hydrogen battery charger is 1.4V, which provides conditions for this 1.5 times longer charging time.

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