When I first started to vape a few months ago I started with a kr808d-1 system from Vapornine which worked really great with all cartos that I tried on them. I then purchased some replacement batts from Vaporkings and thier batts didn't work with half the cartos that I had.
I did some research and found this pic which showed two different types of kr808d-1, old and new styles.
I have attached a pic I found showing the difference in the batts (hope it posts).
I guess what I am saying is be aware of some of the batts that you purchase. Some vendors are trying to get rid of old stock at cheaper prices and they don't identify if they are older or newer styles.
I did some research and found this pic which showed two different types of kr808d-1, old and new styles.
I have attached a pic I found showing the difference in the batts (hope it posts).
I guess what I am saying is be aware of some of the batts that you purchase. Some vendors are trying to get rid of old stock at cheaper prices and they don't identify if they are older or newer styles.