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What Do You Have to Know About The Battery of Emergency Lighting?


As one of the core components of emergency lighting, the battery plays a vital role. Today I would like to introduce the difference between lithium battery and nickel-cadmium or nickel-hydrogen battery.

Lithium battery is like a gust of wind quickly occupying the solar energy storage system. The lithium battery industry is developing very rapidly. The field of application is becoming more and more extensive(emergency lighting, electronic products, auto industry and so on). It can be said that our technology life is inseparable from lithium batteries, and now it is on the market. The most used is the 18650 lithium battery. Compared with the traditional lead-acid battery, the lithium battery has the characteristics of high open-circuit voltage, low self-discharge, high discharge rate, wide operating temperature range, fast charging speed, no memory effect, and no pollution. Here are some specific differences:

emergency lamp battery

#1. Weight aspect

In terms of the voltage of each unit cell, nickel-metal hydride batteries and nickel-cadmium batteries are both 1.2V, while lithium-ion batteries are 3.6V, and lithium-ion batteries are three times as high as nickel-hydrogen and cadmium-nickel batteries. Moreover, the weight of the same type of lithium-ion battery is almost equal to that of a nickel-cadmium battery,

while the nickel-hydrogen battery is relatively heavy. However, the lithium-ion battery has a terminal voltage of 3.6V. When the output voltage is the same, the number of individual batteries can reduce by 2/3, so that the weight and volume of the formed battery pack reduce.

#2. Memory effect

Nickel-cadmium batteries have a memory effect, so regular discharge management is required. This kind of periodic discharge management is passive management under a fuzzy state. Even when the cadmium-nickel battery charge is not accurate (discharge every time the cadmium-nickel battery is discharged or used after several times, due to the production of cadmium-nickel battery) Vendors and usage vary and vary). This cumbersome discharge management is unavoidable when using nickel-cadmium batteries. Relatively speaking, lithium-ion batteries have no memory effect and are very convenient and simple to use. It is not necessary to consider the residual voltage of the secondary battery, and can directly charge, and the charging time can naturally be shortened.

The memory effect is a big enemy of rechargeable batteries, which is generally thought to be caused by long-term incorrect charging, which can make the battery premature. The memory effect makes it impossible for the battery to be effectively charged, and the phenomenon of full charge and one discharge is completed.

The method to prevent the memory effect of the battery is to strictly follow the principle of “sufficient light emission”, that is, to discharge the residual power in the battery before charging, and to charge it once enough. Generally, cadmium-nickel batteries are prone to memory effects, so pay special attention when charging; nickel-hydrogen batteries have no memory effect in theory, but in use, it recommends to follow the principle of “sufficient light emission”. Which means that many chargers provide discharge additional functions reason. For a battery that has a capacity drop due to a memory effect, it can be repeated several times by one-time sufficient and one-time light discharge, and most of the batteries can be repaired.


#3. Self-discharge rate

The cadmium nickel battery is 15%/month to 30%/month. The nickel-hydrogen battery is 25%/month to 35%/month. And the lithium-ion battery is 2%/month to 5%/month. Among the above three types of batteries, the nickel-hydrogen battery has the highest self-discharge rate, while the lithium-ion battery has the lowest self-discharge rate.

#4. Charging method

The charging problem of rechargeable batteries has always been the focus of people’s attention. Correct and good charging methods can ensure the battery life. There are various charging methods recommended for rechargeable batteries. Different charging methods have different requirements for the charger’s circuit, which naturally affects the production cost of the charger.

The relationship between the battery charging time and the charging current is: the charging time can be obtained by dividing the battery capacity by the charging current. Considering the loss during charging, the obtained charging time multiplied by a factor of 1.2.


Through the introduction of the above article, are you more clear about the choice of emergency lighting battery? Please leave us a message if you have any questions.

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