"LR" stands for Low Resistance. Low resistance means more current flowing through the circuit. More current, more watts, more heat.
Having said that, if your
batteries are getting noticeably hot that's not a good thing.
batteries do get warmer as they deliver current but they should not get too hot. I assume the eGo batteries are protected? In that case, the protection circuit *should* guard against over-current (drawing current at a rate greater than the battery was designed to deliver).
Didn't answer the question did it... You can expect things to warm up but they shouldn't get too hot. The atomizer I wouldn't worry about too much. Having an atomizer get hot enough to (almost) burn your fingers is not that uncommon and fine. Having a battery get hot enough to do that is uncommon and probably not good.