When using 18650 battery’s make sure you care for the wraps and don’t use any with nicks or damage. These battery’s are not made for vape products but are widely used and perfectly safe as long as you look after them

These pair of 25R have been with me for at least 3 years now, they are pretty beat, but they work pretty good, exceeding my expectations, charge its reduced for sure but still good enough, I recommend these batteries for vaping aplicatipns