What is the difference between the ARB-L18-2600 and the ARB-L18-3500 batteries?

The difference between these two batteries is their capacity. The ARB-L18-2600 18650 battery has a 2600 mAh capacity whereas the ARB-L18-3500 battery has a 3500 mAh capacity. The higher the capacity, the better runtimes you'll see with the flashlight. 

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