At moment I am using Ego1100 and Evod BCC would I notice the difference when I upgrade is it like whatching Black and White telly then colour HD telly
upgrading to vari volt/watt battery will allow you the experiment with different volts/watts with the evods you have now, to find what works best for you.
Depending on what coil size you have in your evods at the moment, lowering this to about 1.6-1.8 ohm heads from the standard 2.5ohms, will give you much better vape production.