Here are our chief engineer suggestion to use our products correctly:
For our 1.6ohm coils,the reasonable voltage is:3.0V-4.2V,use it with normal e-go battery,which have constant voltage output.
For our 1.8ohm coils,It is better to use them with voltage adjustable battery,the voltage should be 4.2-4.8.
For our 2.1 ohm coils ,the reasonable voltage is:5.0-6.0V,use it with voltage adjustable battery
What's more,high proportion of VG e-juice or high sugar/sweetener/nicotine content e-juice will also affect the coils life.we suggest to use our products with VG proportion less than 50%(0%-30%)
Have a nice day!