If the contacts and 510 pin are all in good order, it's going to hit as hard as your batteries and build allow it to hit. Juice getting inside isn't going to cause a fire or anything so don't worry. The only bad that could happen would come from you completing the circuit (hit the firing button) while liquid is present in the path of the electrons in the current. Either that or somehow a highly conductive, ionizing liquid ends up contacting the positive and negative of the cell(s). Even then, you might not. Depends on the impurities of the Eliquid, as most liquids in a pure state won't conduct electricity at all, what makes water conductive is the salt content. So I would say you have little to worry over, just keep it clean and try to avoid over dripping on RDA's and using leaky RTA's.