Hi, i have an old palm m125 and i am happy to use it as ebooks reader. I use on it rechargable ni-mh batteries and they work very fine. However i must to recharge often and i should to know if there is an ac adapter to use with the usb cradle that have a plug connector. I have used an universal adapter setted with 4.5Volt and 0,35mAh, but it does not work. Must i set the polarity, too? The central pin is positive or negative? .................where can i buy an correct adapter?