ok pat I was thinking it said 450 amp hours on the one that I have but I will freely admit I could be wrong. here is the link for the one I was looking at on the samsclub website
Sam's Club - Power On Board Jump-Start-System
here are the specifications for it.
12 volt DC portable power supply
260 PSI air compressor inflator
450 amp instant starting power
Built-in emergency area light
Charging and battery status indicators
12 volt DC output socket with automatic short circuit protection
26 inch heavy-duty welders type cables
Rugged, weather-proof, unbreakable housing
Automatic charger prevents over-charging during AC recharge
15 inch air compressor hose
Includes: 12 volt ac/dc power cord, 120 volt ac/dc adapter/power cord & air inflator nozzle adapter set
Dimensions in inches: 12.5H x 11W x 7.5D
I dont know if the prices at all samsclub are the same or not at my club this one is 39.48 I did notice that it has automatic charging. I know I just plug mine in and leave it alone when I need it I unplug it. I have used mine to run my winch and if I remember right my winch is a 2.5 horse series wound motor. I believe that it will use a whole lot more current than a pump would. Now I will be the first to admit that it does not run my winch longer than a few minutes but if I remember correctly again I had my winch motor off trying to use it to power my hydraulic pump for my dump trailer. at the time the pump was off the trailer and I was just running liquids through it so not much load on that 2.5 HP motor but it ran it an easy 20 minutes or so. I thought that it would probably run his pump for more than enough time to do what he needed. Pat I am glad that I inspired you to look into one of those. my b6100 kubota battery died and I was not sure whether it was the battery or not so I grabbed my jumper pack and just hooked it up to the dead battery on the kubota. I ran the glow plugs for 30 seconds and then tried the starter it started it just fine. Granted that is a small engine but it is a diesel and it had a battery on it. The battery pack was still able to start it. On the other hand I do have a good battery charger with start mode when I need it. I am a firm believe that you cannot have too many toys or tools if you differentiate between the two words.