98 528i replaced battery now connector is loose.

[jeffbeck]

I recently replaced the battery on my 98 528i. I got the battery at Auto Zone and it came with all these felt pads and gel for preventing corosion.. My problem is that on the Neg side, the cable is very loose. I've got it as tight as possible, but because of that gel he had me put on the connector just slides around. I've tried removing the gel, but it's still loose, you can easily jiggle the cable around, causing me to loose connection to the battery at times when the car is off..

What would be the best method for making the negative connector on the battery a little thicker, or is there anything out there that's specifically for this purpose??

Thanks

Leo