How do you hold your lipos down in a 3905 Maxx

[C-5Quad]

Ok I took the lipo plunge and swaped from 7-cell EG4600'S to maxamps 4000hv 2's lipos


4000's because I got a deal on them....I will get 6 or 8000 later
on if I like them and when I have an extra $250 I can spend.


but how do you secure them in a new 3905 E-maxx? these bats are super slim and short???

Pic's would help a ton because I have to show my dad how to do it because im a Quadriplegic and cant do it my self