When you start talking about 18650 batteries and vaping, the conversation will inevitably turn towards safety. Everyone has heard stories of people's batteries overheating and exploding. Resulting injuries have vapers and manufacturers feeling justly wary of high-output systems.
For lithium battery manufacturers, the answer has been to place the choice of battery in the consumer's hands (sometimes) and to create safety precautions using high-tech chipsets that regulate the temperature of a vaping mod. Consumers are left with the decision of which batteries to purchase when one is not built into their system already.