I was stunned to find rechargeable batteries for those portable DVD players. The price range is 40, 60, 72 depending on capacity. This made me very happy, because these batteries for laptop computers cost $100+. A little cutting and tweezing for the adapter could make these useful on laptops. And a low power laptop would find these very useful. When I get a chance to research this I will. Somebody more experience must have looked into this already.