1. Check the appearance and packaging

First of all, lithium battery products can be judged from the packaging and appearance. Although the appearance of general products is deceptive, some inferior products can also be screened out from the appearance.

2. Compare the weight

The weight of a lithium battery is directly proportional to the capacity. If it is a polymer lithium battery, if the weight difference is too large, 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.

3. 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 the 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.

4. Test live work

During the live working process of the lithium battery, if the two poles of the battery are not hot after continuous discharge for about 10 minutes, it proves that the battery protection board system is perfect. Generally, the quality of the lithium battery with a high-quality protection board is better than that of the ordinary lithium battery.

5. Look at the battery cell

Most of the cells used in lithium batteries are soft pack cells and 18650 cells, which are also common materials for lithium battery pack cells. 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. If the manufacturer has a problem during production and the quality is not good enough, it is easy to explode.

The above are some small methods for judging the quality of lithium batteries for reference.