What type of batteries do you need for a Sony portable DVD player?

Many different brands can be used. AA is the most common form used in electronic devices, but depending on your DVD player, this could be different. Yours may be rechargeable. The best brand of batteries is RadioVac. It has just as much energy as the big brand name, but a fraction of the price. Looking up the battery type should be easy, just look in the owners manual, or just open the batterer slot and it should be written.