I'm working on a portable GC with minimal-ish modding due to moneys and accessibility and the such so i don't want to ruin anything. my screen uses 7.4v and has a batt. (it was a portable tv) that's 3.7v (uses 2A). i am going to get a custom battery pack made for this project and was wondering how i would connect the t.v. and cube to same batt. without ruining the t.v.