How to distinguish the quality of 18650 lithium-ion battery packs? Here are several methods for your reference:
1. The fastest inspection method is to test the internal resistance and maximum discharge current. A high-quality lithium-ion battery pack has a very small internal resistance and a large maximum discharge current. Using a 20A range multimeter and directly short circuiting the two electrodes of a lithium-ion battery, the current should generally be around 10A or even higher, and can be maintained for a period of time. A relatively stable battery is a good one.
2. Look at the appearance. The fullness of the appearance, for example, lithium-ion batteries with a general capacity of around 2000mAh tend to have a larger volume. The workmanship is relatively fine or the packaging appears fuller.
3. Look at the hardness. You can gently or moderately pinch the middle part of the lithium-ion battery with your hand. If the hardness is moderate and there is no soft squeezing sensation, it proves that the lithium battery cell is a relatively high-quality battery cell.
4. Look at the weight. Remove the outer packaging and feel if the battery weight is relatively heavy. If it is thick and heavy, it belongs to high-quality battery cells.
5. During the charged operation of the 18650 lithium-ion battery pack, if the two poles of the battery do not heat up after continuous discharge for about 10 minutes, it indicates that the battery protection board system is complete. Generally, lithium-ion batteries with high-quality protection boards have better quality than ordinary lithium-ion batteries.