Well found Matt Looks like the contents of page 9 highlight some potentially critical issues. Time will tell. David In a message dated 13/04/2011 20:11:43 GMT Daylight Time, sq7dqx at poczta.onet.pl writes: http://arissat1.org/media/pdf/ARISSat-1%20CDR%20Battery.pdf very interesting document ... any professional comment? Matt SQ7DQX