With the rapid improvement of the technical level of lithium batteries, the cost of lithium batteries has continued to decline. The advantages of higher energy density, lighter weight, less pollution, and longer service life have made lithium batteries more and more concerned by the industry in areas such as electric bicycles.

　　 At present, various brands of lithium batteries are mixed in the market, and it is difficult to distinguish between good and bad. How to choose a new national standard lithium battery has become an urgent matter for distributors and consumers!

　　 One, check the appearance and packaging

　　 The quality of a battery can first be judged from the appearance and packaging. A product that does not even do the details on the packaging is definitely not a professional product. The appearance can help us filter out some inferior products.

　　 2. Comparison of weight

　　 The weight of a lithium battery is directly proportional to the 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 capacity of some batteries. In addition, you can also perceive whether the weight of the battery is relatively heavy from the outer packaging. If the weight is heavy, it is biased towards high-quality lithium batteries.

　　 Three, test internal resistance and maximum current

　　 In fact, the fastest inspection method to judge the performance of lithium batteries is to test the internal resistance and maximum discharge current. A good quality lithium battery has very small 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.

　　 Four, detection of live work

　　 During the live working process of the lithium battery, continue to discharge for about 10 minutes if the battery poles are not hot, 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.

　　 Five, look at the battery

　　 The most important part of a battery is undoubtedly its cell. At present, most of the batteries used in the market are soft-pack batteries and 18650 batteries, 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. The current electric vehicle batteries are basically 18650 batteries, which are mainly made of lithium iron phosphate, lithium manganese oxide and ternary.