Method 1: check the appearance and packaging
Lithium-ion 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.
Method 2: Look at the product battery
First, check whether the battery is brand new, because there are some bad small workshops on the market that use second-hand batteries to make lithium-ion batteries. The battery is good, the safety is higher, and the quality of the lithium-ion battery is better!
Method 3: test live operation
In the process of charging the lithium-ion battery, if the battery is discharged for about 10 minutes without heating, it proves that the battery protection board system is perfect, and the quality of the lithium-ion battery of the high-quality protection board is generally better than that of the ordinary lithium-ion battery.
The weight of a lithium-ion battery is directly proportional to its capacity. If the weight difference is too large, the capacity will definitely be insufficient, but some batteries have different capacities. In addition, the weight of the battery can also be sensed from the outer packaging. If it is heavy, it is biased towards high-quality lithium-ion batteries.
Method 5: Detect internal resistance and maximum current
In fact, the fastest way to judge the performance of a lithium-ion battery is to detect the internal resistance and the maximum discharge current. A good-quality lithium-ion battery has a very small internal resistance and a large maximum discharge current. Using a multimeter with a range of 20A, the two electrodes of the lithium-ion battery are directly short-circuited. The current should generally be around 10A, or even higher, which can be maintained for a period of time. A good battery is relatively stable.