to everyone not wanting to use tape.....you should!
battery strap will change chassis flex
also if tape is really annoying for you then you can do the old skool pro's trick: take a long piece of tape and feed it through one of the tape slots like normal, then feed it back up through the very first cell slot. then stick it back to itself. this will give you a long piece of tape that isnt sticky on either side. now do the same thing for the other end of the battery.
then cut each one so that they meet up in the middle of the battery.
then all you have to do to tape ur pack in is to tape the two pieces together!
then again its not all that secure
but it sure is quick