Looking to get a Jump Start Pack for my daughter's car. Any suggestions? It's Subaru Forrester.

 

I've had one of these for about 4 years. Has jump, air comp, 110v inverter and led lights. The battery is getting weak so I guess I'll open it up and replace the dry cell. Probably get another 4-5 years.

 

How long would they hold a charge for jumping before charging is necessary?

 

I carry mine in my company truck for months at a time and I only charge it after I have used it enough to run it down. I've not had an issue with it just going dead without use. It has a charge indicator light on it as well. Keep in mind also that any battery over time will go bad. Mine's been well used over the last 4+ years and is just now starting to go bad. If mine didn't get used and need to be charged I would pull it out and charge it every 4-6 months or so just to be safe.