Use only protected batteries or better still, use safer chemistry batteries
In our market today, there are many kinds of*batteries*that can be used in a*mechanical*mod.
Two of the most popular*battery*types used in mods are ICR (LiCo02) and IMR (LiMn) / IMR hybrids. Both of these are lithium-ion (Li-ion)*batteries.
In terms of use, technically, any of these can be used on any device that requires a 3.7volt power source, including yourmechanical*mods. But not all are suitable.
In terms of safety the difference between the two (ICR and IMR) is the chemical composition in these*batteries. ICR can catch fire at a faster rate than IMRs because they are simply more combustible. ICR are also generally known to stress more easily than IMR. There are two types of ICR*batteries, protected and unprotected. Never use unprotected ICR in any*mechanical*modas it does not have any safety mechanism in them.
Protected ICR*batteries*have a basic layer of protection that prevents your*batteries*from shorts and over discharge problems. Protected ICR with a C rating of 2 amps or more can be used in*mechanical*mods.
IMRs however, has a more stable chemistry, and won't likely to catch fire or explode as easily as an ICR can. They do not require protection, and often sold without it. These are also suitable for*mechanical*mods.
You may ask, what is better an IMR*battery*or a protected ICR*battery?
The general consensus within in the vaping community is that if in doubt, IMR is better for*mechanical*mods. The reasoning is, although IMR has no protection circuit, by nature of their chemical composition, they are safer than ICR with a protection circuit. Protected ICR*batteries*have a history of their protection system failing, especially with the cheaper ones. In fact, we have read more incidents of cheaper protected ICR*batteries*venting flames than IMRs.
An analogy to this is that a protected ICR is like a gun with the safety switch turned on, and an IMR is a gun someone filled with rubber bullets. Both guns can hurt but one is more hazardous.