Oh I see. I don't think they are any less vulnerable to impact than any other type of battery, only to over charging & over discharging but it's not like they will blow up upon impact or anyhting like that. They're still just a battery, not an explosive. They are also hanging right out there on the side of the fuse on our Foamies too, held in place with nothing but velcro & 3D Foamies tend to get crashed a lot harder than what any Slowstick would be capable of. IMO.