Best battery features ever!
I got this battery as part of a Hemper box. It takes a little time to learn how to operate the battery using the control button, but I quickly became an expert. This battery allows me to extract vapor from cartridges that regular batteries can't touch. In other words, cartridges that I used to throw away now have several buzzes added to the life of the cartridge. One caveat, keep your tongue out of the stream of vapor, or you can burn it.