Battery Leads Coming Loose

[bbuncher12]

To connect our batteries to the battery leads, we use a small bolt and locknut and torque them down to make sure that the battery leads do not come lose, then we cover the lead and connection to the battery in heat shrink tubing. However, we have been having issues with the leads becoming loose and flopping around because the bolts are not holding well. What methods do you use to keep the battery leads attached to the battery, and do you try to avoid this problem? Thanks!