Had the unit for awhile and it works great with the Aspire Mega tank. I've contacted the company several times and the most info I could get is what kind of battery and wattage of it to use when you replace the battery. I cannot figure out how to open it up. Anyone know how it is put together. The only way I can think of is to put a tank or something in the top threads and pull it apart. Doing anything to the bottom cap will obviously destroy it. I'm thinking I'm going to have to replace the whole thing because it wasn't made right.