Thank you for the responses - I have not been getting the emails from scubaboard for some reason and didn't know there were responses. That being said, I will check out the references made.
The "good" news is that a replacement of the battery seemed to sure the computer's problems, so I will still be diving with a Cobra, but maybe it is time for a new one anyway...
to mucikbiz22: Hoping this doesn't drag this thread far afield with the usual slams and digs that seem to come up when one tries to explain their issues... but to clarify, I like to do 3 or 4 dives a day for the 5 or 6 days of my week-long vacations. Dives range from 40 to 90 feet usually and my dives are normally about a hour long (only reason I get out earlier is if the dive shop has a tight schedule and requires us to stick to it - or if the dive is very deep and my buddies are our of air) But when I dive somewhere that Nitrox is not available, such as Cancun, if I try to keep up my schedule, buy the 3rd day my no deco times are getting very low quickly and I have to cut my dive time in half or take a day off. As I said I have a Cobra and Zoop and both computers read the same. AND my dive buddy who has a Cobra and dives very similarly to me had the exact same readings! Diving with 32% allows me to keep up the schedule I enjoy, but not 21%.
Sue