HORRIBLE BATTERY!!!!!

Ok, so, I received this portable dvd player for free, so obviously, I can't complain about the price. When I first used this unit, I loved it. The battery lasted almost 4 hours, the picture was great. The only downside was the tinny sound of the speakers. A pair of good headsets solved that problem.
Then the problem started. I used this only three times, and now, the battery will not hold a charge. It works maybe 4-5 MINUTES before the battery shuts down.
I have contacted the company, and they offered a new battery for 40 dollars. I was considering buying one, thinking maybe it was just my battery that was defective. Then I talked to others who bought this same DVD player. They ALL had the same problem. I will not waste 40 dollars on a new battery.
The DVD player still works fine if plugged in to a AC outlet. But, what is the point of having a portable player, if you need to plug it in.

Never again

Initially I thought I was getting a nice unit. I took it on a trip (first time using it) and found the battery was dead after charging all night. It played using the ac/dc plug a few times. Now, the battery won't charge AND it will not even turn on while plugged in to the ac/dc plug. I was going to buy a battery until I found out the battery cost more than the unit itself. Go figure! DO NOT WASTE YOUR MONEY!

is there a zero rating?

I bought not one, not two, but THREE of these (Model D1708). All THREE died within in about 20 hours of actual dvd-watching time. And just try to find the company (Audiovox) to repair it. No way. I've looked online forever to find somewhere I can send these 3 duds to no avail. Don't buy this product. Pay a bit extra and get one that will last a while.