External size are: 33x46x82.
U can feet with 2x 18650.
The board is this one: http://fave.co/2bsgekX
About battery contact i used keystone 5209 (there is 73 mm space, so u can use whatever u want).
U can found keystone 5209 on Amazon: http://fave.co/2bsgxvX
About battery: are connected in PARALLEL.
The board show a lot of information like, follow the link or take a look to the shoots.