[Urban Hawk]

well... there is one rule that you just have to make sure you don't break and that is

<R59> The control system is designed to allow wireless control of the ROBOTS. The Driver Station, cRIO Mobile Device Controller, digital sidecar, breakout boards, power distribution module, speed controllers, relay modules, wireless bridge, batteries, and battery charger shall not be tampered with, modified, or adjusted in any way (tampering includes drilling, cutting, machining, gluing, rewiring, disassembling, etc.)

that means that any method of securing it which involves modifying the battery will not be allowed. just pay attention to that one rule and make sure that your battery doesn't go flying when hit and you'll be fine in competition.