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The so-called 18650 lithium battery and 26650 lithium battery represent the sizes of lithium batteries. For example, for the 18650, the number "18" represents the diameter of the battery, and "650" represents the height of the battery, with the unit of length being millimeters. Regarding the discharge performance and such, it has nothing to do with the model like 18650. A123 has 18650 battery cells, and Lishen also has them. The former is a power type, while the latter is a capacity type, so their discharge performances are naturally different. In principle, the greater the discharge, the greater the impact on the battery life. For example, A123 claims a maximum discharge rate of 30C. If you discharge at 30C for a long time, its service life will end quickly.

There is definitely a difference in the endurance time between the 18650 lithium battery and the 26650 lithium battery. Since these two models are named according to their sizes, for the 18650, it means the diameter is 18mm and the height is 65mm. From this perspective, the 26650 must be a bit larger in volume than the 18650. Therefore, there is more space to fill materials and achieve a larger capacity. Currently, the capacities of 18650 batteries are 2200mAh, 2600mAh, 3100mAh, etc., while the capacities of 26650 batteries are generally 4000mAh, 4200mAh, 4500mAh. As a result, the endurance time of the 26650 will be longer.

In terms of the volume of lithium batteries, the 18650 lithium battery and the 26650 lithium battery are completely different. However, they can be modified to fit each other, but there are also differences. For a thicker barrel body to hold a thinner battery, there is a kind of adapter sleeve that can thicken the 18650 battery so that it can be installed in a flashlight that uses the 26650 battery.

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