I've realized I guess through trial and error that the Tumi Battery Mod has a stronger connection than than the Incipio. I've wrapped both twice. The Tumi Battery worked perfectly every time. I decided to change it over to red as it's my preferred color for the case back. Both times I've wrapped the incipio I of course wrapped it just the same as the Tumi and it would not connect even though it was attached to the Force. Nothing at all was in the way of the connectors on either battery so I have to assume for some odd reason the Tumi must have a stronger device to device connection. I wrapped both to have very minimal material that actually wraps behind the cast. Almost to where it's barely around the edges. Anyway here is my Tumi in Red modded and now with a much better texture for grip