I knew that my battery was going to fade away soon. The sound of the engine turning when starting sounded more labor some than it did with a fresh battery. I did not want to replace it until it was completely gone. I purchased this jump pack to carry in my truck for a precaution. It served me well, as when the battery finally failed to start the truck, I utilized this fully charged jump pack to start my truck in order to go to work; once again when leaving work to go to the battery store and once again to drive home from the store. With 3 starts, the pack only degraded from 100% to 97%.
This device is reliable and much easier to use than jumper cables, (which would require assistance from another vehicle).
I will top off the charge on the weekends and keep this handy device inside my truck for future emergencies.