Put some protection between your battery and your mod. Anyone using stacked batteries or a mechanical should have some sort of battery fuse. For just a few dollars you can give yourself some extra insurance.
THE HARD COPY:
The SafeVape chip can be use for any kinds of dry batteries, such as 18650, 18350, 18500, etc.
SafeVape chip can protect the battery from short circuit, thus avoiding
any possible explosions.
The SafeVape chip can help prevent the overheat of your batteries
The SafeVape chip provides overcurrent protection