Lookah Load Cart Battery

I love this battery when it works. I have tried it on 5 different vape cartridges. 2 will not work at all. On others I have had to repeat **** them on and off until it works. On one I had to blow on the threads a couple of times. I do keep them clean so I do not understand why this occurs. When it works it is super. My previous one broke while unscrewing a cartridge.

Too bulky when the cartridge is in. Didn’t come with instructions, so no clue if it has adjustable settings. Works if you have nothing, but imo pretty crappy. Stinks there’s no refunds if used.