What kind of lithium battery is good and what kind of poor quality?

As many people in the industry are more optimistic about the future prospects of lithium batteries, there are more and more types of lithium batteries on the market. There are many different brands of lithium batteries, and it is difficult to distinguish between good and bad! Check the appearance and packaging First of all, you can judge the lithium battery product from the packaging and appearance. Although the appearance of general products is deceptive, some inferior products can also be screened out from the appearance. The weight of a lithium battery is proportional to its capacity. If it is a polymer lithium battery, if the weight is too different, the capacity will definitely be insufficient, but there are differences in the size of the capacity of some batteries. In addition, you can also feel the weight of the battery from the outer packaging, if the weight is heavy, it is biased towards high-quality lithium batteries. Testing the internal resistance and maximum current In fact, the fastest inspection method for judging the performance of lithium batteries is to test the internal resistance and maximum discharge current. A good quality lithium battery has very low internal resistance and a large maximum discharge current. Use a multimeter with a 20A range to directly short the two electrodes of the lithium battery. The current should generally be about 10A, or even higher, and it can be maintained for a period of time. A relatively stable battery is a good battery. Picture detection live work During the live working process of the lithium battery, if the battery poles are not hot after continuous discharge for about 10 minutes, it proves that the battery protection board system is perfect. Generally, the quality of lithium batteries with high-quality protection boards is better than ordinary lithium batteries. Look at the batteries used in lithium batteries, most of which are soft-pack batteries and 18650 batteries, both of which are also common materials for lithium battery packs. First check whether the batteries are brand new, because there are some bad small workshops on the market that use second-hand batteries to make lithium batteries. Soft-packed lithium batteries, also known as polymer batteries, are batteries with a gel-like soft-packed electrolyte that can be made into various shapes. The battery is safe and will not explode. Current electric vehicle batteries are basically 18650 batteries, which are mainly made of lithium iron phosphate, lithium manganate and ternary. The packaging of 18650 batteries is generally made of steel shell. If the manufacturer has a problem during production and the quality is not good enough, it is easy to explode.