[Elecraft] Securing a battery in EC1???

[hamblen9 at optonline.net]

I'm looking at using an EC1 for the new Power-Sonic PS-1251FP 5.4 amp hr battery with plenty of room for a KD5NDB controller.  My question:

What have others used to physically secure a battery in an EC1?  I could use velcro strips but am interested if there are other alternatives?

Thanks in advance, Guy N7UN/2