I purchased a vaporfi pro 2 kit to get started, and some of the dual coil 1.5 oh atomizers it came with. It comes with the 650, 3.7 volt battery. Some of the juice I bought couldn't be used in that tank, so I went ahead and ordered a Kanger Pro 2 tank and some other juices from Mt. Baker. This tank came with 2.5 ohm single coils, but I ordered an extra box and got the 1.5 ohm. After doing a little reading I'm afraid these may be unsafe with this battery. I don't mind ordering more if I need to, but can these be used safely with a 3.7 v battery?