Look at the shell of the machine

    Basically, the exterior workmanship of a product represents the quality level of the product.

    Even if it is faked in the exquisite shell, there is still a gap between the real product in the overall industrial design. Since there is only one product in front of us when we buy, there is no comparison. Here we are looking at the following:

    Whether the interface of the portable power bank and the opening of the shell fit well;

    Whether there are abnormal noises caused by loose items inside when shaking the mobile power;

    Look at the joints of the shell. Are there burrs?

    Is the art line of the upper and lower covers or where the parts are combined is neat?

    Is the gap uniform? Is the shell shrinking?

    These can be checked carefully under light or sunlight. If there are defects in these areas, they are most obvious when viewed in backlight. In addition to these, also pay attention to whether there are chromatic aberrations in the surface color, and whether there are black spots.

Look at the parameters of the machine

    This method is more suitable for those portable power bank produced by unknown small factories. For example, a small portable power bank has a high nominal capacity, such as a 6000-7000mAh power bank, you must be very careful.

    At present, 18650 batteries and polymer lithium batteries are the most commonly used batteries for mobile power supplies.

    The 18650 battery is cylindrical, with a diameter of 18mm and a height of 650mm. The maximum capacity is 3000mAh, and it is generally made into a cylindrical power bank with obvious rounded corners.

    The polymer lithium battery can be customized by the manufacturer, and there is no fixed shape. The capacity of the polymer can be very large, and at the same time, the volume can be increased, and it is generally made into a box-type portable power bank. Generally, the capacity of a polymer the size of a credit card is between 2500-3000mAh.