Originally Posted By: RNewcomb
I learned the hard way about 10 years ago about keeping those Emergency Jumpers plugged in and charged - I had one that I hadn't plugged in for about a year, and when I needed it, it didn't work. I've read you need to top them off every 30 days or so.


Mine went completely dead after about 5 years. I called the manufacturer. The tech said the huge battery in it has a shelf life of 5 or 6 years, no matter how you treat it. He was actually kind of laughing at my ignorance.

I used it exactly once over the five year period. I won't be buying one of those devices again. I don't know how long it has been sitting on the store shelf. Also, I would need to replace it after 3 years or less in order to ensure it will be working when I need it, and that's assuming it was sitting on the store shelf for no more than a year.
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If you're reading this, it's too late.