My 7 cell pack is tight but it does fit without flexing or needing mods to the strap. I bought an intellect pack and it had a plastic cap at the end where the wire comes out, that didn't fit so I had to cut it off and retape the cells up. If yours is to tight to get the strap on you can raise one of the hold down screws and loop the strap around the threads and that will give you another 1/16th" or so.