I won't pay anything for that because it is near the end of its service life!!! According to Uwatec User Manual: the battery life is 13yrs if it is being used for about 50 dives per yr and much less so if used more often.I have come across a OMS/uwatec bottom timer which appears to be from 2002 but still works. Would this be worth while for 75$? Should I consider something else?