Each time I shut down my Power Computing Power Tower Pro 225 (which has a Newer Tech 400 MHz G3 card installed), the date resets to 1956. I assume that this means that the internal battery has failed. Does any one know if this battery is easily removed, socketed rather than soldered in, and if a replacement can be obtained? I'm trying to save myself the trouble of dismantling my entire set-up for nothing. Thanks.