Question about E-Power Eureka E! Power Pak 2 12VDC Battery for N!ergy Tents 18 Ah Power Inverter

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I used the Eureka power pak 2 to run a small fan for about half an hour one day and recharged it immediately after I was done. About a week later my power went out for about 5 hours and I wanted to use the power pak to run a lamp, and when I tried all it did was have the alarm come on. The first time I used it, you could hear the power pak turn on and run. With the second time there was nothing but the alarm, no cooling fan or anything. I followed the instruction book to the letter with no results. I plan on taking it back to the store but I though I would check online first.

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