My T3's usually leak seep e-juice from the bottom after not using them for a day or so. I started storing them upside down in my carrying case and problem solved. As long as you let the T3 sit upright with juice in it, there will be some juice trying to get out and possibly leaking on the battery. I bring a full spare T3 with me to work and as long as I store it upside down I have no drippage from the bottom. Keeping them upright is like storing a Vision clearomizer upside down. That would result in seepage. I hope this helps someone out there.