The new K1 Plus now features a standard 510 threaded connection which makes it compatible with most of today’s batteries and devices. It’s also childproof and leak resistant and the top-fill system makes filling up the tank a breeze. The K1 tank also has replaceable 1.8ohm coils and is also compatible with Aspire original BVC coils and Aspire Spryte coils. Many users will appreciate the fact that the coil head can now be changed without having to empty the tank first.