Nope, it won't fit!
Finally got around to getting in touch with BDX and BCIL is correct, the tank will not fit on the 1100 regardless of what you do with the battery. Not that I doubted you BCIL, but I was sure hoping you were wrong. :face-icon-small-hap
So now that makes me wonder what is different and will the larger '14 tank on the 800 fit. I want more fuel capacity and I hate having gas cans strapped to my tunnel.