Not bad really
I have one of these units and it lasts me with my jwin portable dvd player about 5-6 hours. As I recall no effective directions for charging came with unit. Directions basically said to charge for a couple of hours. Not really sure how many hours that means. Personally I experimented and found that between 9 to 12 hours results in 5 to 6 hours playtime.
Rating: 4 stars