Grab a Q-Tip and dip it in rubbing alcohol, then carefully clean where the battery and cartridge meet on both products. Then, make sure to completely dry each piece before screwing them back together.
If this doesn’t work, it could be because your cartridge is an irregular size or has a deformed coil. Sometimes you can solve this issue by simply tightening or loosening the cartridge until you find that sweet spot that makes a good connection. If your cartridge is just simply not compatible with a 510 threaded battery, it might be time to look for a new brand!
It can be nearly impossible to tell by looking at it, but now and again legitimate dispensary cartridges will, unfortunately, have a deformed coil. This means that the hardware doesn't line up correctly with the heating element of the battery, forcing the error. To determine if this is your issue, try a different cart that you know has worked with your pen before. This can be an empty cart, or just an old one laying around. If this other cartridge works, then the issue is with the new cartridge. Many dispensaries understand that this can happen, and will be willing to swap it out for a different, working one. It never hurts to ask! If neither cartridge works, then the cartridge's hardware is not the cause of the problem.
We recommend only purchasing cartridges from a licensed dispensary (both for safety reasons and the simple fact that you are more likely to get a high-quality cartridge) as these irregular carts can lead to irreparable damage to your Ooze pen over time. Read about why you should do your research before hitting a sketchy vape cartridge.