EGOc battery keeps breaking in pocket - Any alternatives?

[illectronic]

I broke 3 egoc twist batteries already by leaving them in my pocket with a boge cartomizer and tip on. The metal part of the battery gets loose and eventually snaps off. Is there a tougher model of any brand that won't get loose or do I have to just store it better?

 

[chaos-7]

I use only my shirt pockets and cover the cartomizer with a cone.

 

[chaos-7]

E Go cases also work really well.