help with my first DIY Blue-ray

hello guys, i have ordered Blu-ray module from one member here.... i want to be prepared for my first DIY build, so i have few questions....
i dont know how to explain my queries because my english is not very good  :'(  so i attached few pictures which help me expalin what i am talking about...

i asked a seller if module is case negative or possitive and he sad that it will be no case ground....
if i good understand it so it should be like i drew it on the picture 1.... am i right ????
so, my module could be like one at the picture 1/3 ...

my question is simple
do i need to lead a wire to the back side of battery  {pic 2/1}  or is it possible to do it like on the pic. 1=4 or 2=2

i would like to do this that i will attach  a wire to the modul case because in my host is no space to lead a wire to the end of battery...
does my meaning gives a sense???? Is it all right????  I think it could be ok, or am i wrong??? will be there any problem if i will drive any polarity trought case???
do i need to isolate case from batteriess??? It will be flexidrive V3 btw...


next question is about battery.. i am totall lama about mAH, and etc, so i need help which batteries will be fine for me... biggest query i have is about batterys with some protection.. i really dont know what does it mean, and if you guys could me some advice that i will not need any explanation about batteries... i will just follow yours advice which batteries will be best for me...  rechargable batts, of course...
so which  batteries could i use/?????  cr2, 2xaa{a}, 14500, what next????

and could you please provide some links for this two kinds, because probably i will use one of these...
1.   CR    because i am comfused about 3V, 3,6V and etc..
2. AAA ???? battery will be best for my BR?????

Cheers guys

oh, and one final question... how to ground myself to be protected before static harm????? because i have no idea

p.s. dont laugh at my pictures  ;D ;D ;D

pic 2

It is very difficult to understand what you're trying to ask.

In your first pic, use the #3 setup.

The case pin can be tied to ground if you're using the flashlight or heat sink body as your negative connection, some flashlights allow you to do this. You should just go with the normal setup in #3.

-Kendall