How to choose a high -quality lithium battery?

　　In addition to 18650 and 21700, what other common types are there? Which one is cost -effective?

　　There are 14500, 26650, 201700, etc. It is the same size as no. 5. Battery and common flashlights. Because the voltage of the lithium ion battery is 3.7V, it may not be seen on the normal use of No.14500 electrical appliances. 5 battery. 26650 is also used for flashlights. 26650 is larger than 18650, and the capacity of 21700 is even larger. The 20700 words are between 18650-21700, the capacity is greater than 18650, the volume is slightly less than 21700, and the applicable range is narrow.

　　As for cost -effective, it depends on whether you are useful. Take a bright flashlight compatible with 26650 and 18650 as an example. It is more widely used in 18650 and 21700, so they may become more complicated skills and craftsmanship. 18650 may be the most useful type now, but 21700 is a future type.

　　How to choose high -quality lithium ion batteries?

　　1. Check the appearance and packaging

　　First, it can identify the packaging and appearance of lithium -ion battery products. Although general products look deceived, it can also be filtered from the appearance of some defective products.

　　2. Compared components

　　The composition of the lithium -ion battery is proportional to the capacity. Assuming that the polymer lithium -ion battery is too large, the composition is too large, and the capacity will inevitably lack, but some batteries themselves have a large capacity. In addition, the weight of the battery can be seen from the packaging.

　　3. Test internal resistance and maximum current

　　In fact, the fastest way to test lithium -ion battery performance is to test its internal resistance and maximum discharge current. High -quality lithium -ion batteries, small internal resistance, maximum discharge current. Select the 20A range of the multimeter, and directly connect the lithium ion battery with two electrodes. The current should be around 10A or higher, which can be maintained for a period of time. A good battery is relatively stable.

　　4. Work at the test site

　　In the process of lithium -ion batteries, the electrical rods that continue to discharge for about 10 minutes are assumed that it is not heated. The battery protection system is perfect. Generally, the quality of lithium ion batteries with high -quality protection is better than that of general lithium ion batteries.

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