I am a Field Manager and am working in Knoxville currently. I am sitting off in the darker section of the Walmart parking lot during the day as I use my truck as my office and apparently lost track of time as I use my laptop as well as charging my phone and listening to the radio. Well, when it was time to head out and check on my guys up north near the Kentucky boarder I went to start up my truck and you guessed it. Dead (or almost dead) battery. Could get the radio on and the lights but just not enough juice to crank. Closest field tech is about an hour and a half away and I couldn't pull him off the job just to come and give me a jump. I thought what they heck and I am going to do. Then it dawned on me. Walmart is right here. Wonder if they have one of those booster packs (which I have been putting off getting)? Well, locked up the truck and went into the store and saw they had quite a few different brands and levels of peak amps. I decided since I had a truck then my best bet was to get one with the highest peak amps. Sure glad I did. When I got out to the truck I read the manual and it said to charge unit before using. Well I just didn't have that option and hoped for the best. I set everything up and turned the unit on and pushed the button to see what percentage it had. Said it had 96%. Figured that should be enough. I hooked it up and let it sit there for a minute. Got into the truck and nervously turned the key. The starter had just a bit of a time turning the first time over but after that it cranked right up. I'm telling ya, this was a life saver. This will be staying in my truck from here on out. Just have to remember to charge this thing back up soon.