Placing and Locking
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Once you have found the position for the battery where CG (Center of Gravity) can be correctly achieved, install the Velcro to that position by using Velcro sticker/Polyester hook and loop peel-n-stick self-adhesive. Your battery also needs to have Velcro sticker attached. The Velcro attached to plane and battery should not be the same type of Hook/Loop. Just consistent with your choice, for example, all Hooks for the battery and all Loops for the plane or on the other way around.