This unit, the DaVinci iqc, is extremely power challenged. In the first place, the battery does not last hardly any time on a full charge. And even when the battery has a good charge the thing turns off on you for no reason. And I am not talking about at the end of an 8 minute session. It turns off right after it heats up. It's like the effort of heating up the oven is too much for the battery and it momentarily thinks it is drained and the thing shuts down. Repeatedly. It's great every once in a while and vaping a bowl can be like a warm swallow of some kind of fine liquor. Or something. I don't drink fine liquor, much less warm fine liquor, so I wouldn't know, but when the darn iqc is working right, it's just good, but that happens so rarely that the thing still only gets one star, the least I can go. Sorry.