My batt sponsor (http://www.countybattery.comwww.countybattery.com) has every type of battery you could imagine, exept Li-Po. They store their batteries in an air-conditioned warehouse and carry them around in or on crates by forklift truck. If a single small pack fell off a forklift truck,then boom! You could imagine a heavyweight bot with VERY large Li-Po cells come up against Storm II. The forces involved would almost definately leave the packs ending up in smoke...
Cheers, Ewan