Hey folks!
So it's been a while since I've been on here, but with camping season coming I'd dig suggestions on a good portable battery jumper unit. I have a Schumacher one, but for $50 it didn't come with a cable to charge it with. Is that pretty standard? (I'd like to have the cable come in the box, or is that unrealistic?)

I'd like a unit about that price level that I can rely upon for a few years, will hold a charge for use for up to a week or more, and I can rely upon to turn over a stock '92 XJ.

I think I have a problem with my stereo install, it might be sapping electricity while the car is off. (I know I need to fix it, but budget allows for a jumper box.)

Thanks for the help! My girlfriend's nerves will thank you for suggestions as well.