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A year ago, I purchased a Black & Decker car starting batter pack that also was DOA. The word "laptop" in the product description may be deceptive. This unit died when attached to a small laptop. Obviously, I'm avoiding this brand from now on. It is able to partially charge an iPod through one of two USB ports, after long periods of time charging itself.
Unfortunately many have been mislead. You want to be sure you leave it plugged in until the last possible minute.For those looking to power their laptop, you'd be better looking to get one of the $250 to $400 lithium based battery packs that is shaped like a laptop. I can't reliably watch an entire DVD on a portable DVD player (no internal battery). Of course this is nonsense that anyone understanding the meaning of 4000mAh will spot immediately. Amazon, the packaging, and the Black and Decker website all three lead one to believe that this is designed for powering laptops.
The batteries in the pack loose their charge just sitting in storage at a very fast rate. The Amazon site can be fairly interpreted to imply that it will power a laptop for 9 hours. I knew that I wouldn't get nine hours but I'm not getting anywhere near 4000mAh out of mine either. That's what I'm doing now. It works well and is handy but the battery power useable for 120V is closer to 2000mAh.
The Black & Decker power supply works great. Just what i needed as I am often without power when working on my computer.
It appears to charge itself, but it will only charge another device for about 5 minutes before dying. Do not recommend. I need to return it.
I actually bought two but I havent needed to open the second one because the first has performed so well. Rather than buy enough batteries specifically for my camcorder (at $56 each)to tape six hours worth of youth football I bought the Black and Decker 100 Watt Power to go. It could be still on four or five bars when it quits. My only complaint is that the charge status lights do not give a good representation of when the battery will stop working. I bought two of these to extend the taping time for my camcorder. I have run a myriad of small items off of it so far and it has performed very well. It also takes several hours to reach full charge so be patient before you test it out.Summary - For the low price and versatility I am very pleased with this product. It does get warm during use so make sure its out where it can breath.
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