OK so my boyfriend has a limitless matte black copper mod and the griffin 25 plus atty. He runs a dual build and has the LG brown and yellow batteries. He seems to have to change his batteries often. His question is what's a good build and what it should read (ohms) that won't drain his battery life and is safe for that mod and atty. Recently got ultrafire 4.2v batteries that he hasn't tried yet but typically his dual builds on his griffin reads at .3 ohms