OK.
ROK Legend "EGO" battery seems to use both 510 and eGo threading. This is good news.
You can have a look here at possibles... you will need to look at the smaller/cheaper end of the clearomiser selection.
Clearomizers
However, what you are experiencing is kind of expected really....
There is an issue with bog standard clearomisers, which you would do well to take note of. The replacement coils for
many systems are not long lasting.
If you order Kanger Evod or Protank clearo's you will find yourself in the same boat as the ROK system.
OK, so ROK charge £9.99 for 5, whereas Myepack (and others) will sell you them for £6.00, BUT they don't last very long.
I would suggest you should try a few with your battery to see how you go....
Innokin iClear16s last longer. They are a basic plastic tank, not wonderful but work out much better value.
Aspire BVC K1s are good, they last for weeks, not days, but some people find they need a more powerful battery.
Aspire ET-S fitted with BVC coils can be good also.
You can't use the best tanks on sale with a basic ROK eGo battery, so if you stick with vaping, it's worth looking into a better battery.
You can't really fit "better" replacement coils to your ROK tank, such a thing doesn't exist.
Lastly, avoid ROK in the future. Not exactly king of the rip-offs, but a nasty overpriced brand.The kits are competitively prices (aren't they all these days?) but the rest of it is too expensive and low quality.
If you are set on vaping, consider a variable power battery and then you can use all the best tanks.
