gweeks 1 #1 March 6, 2008 Many cypres 1 battery installation dates I've seen just state the month and year of installation, and the orange label on the unit says "last battery change in [month]/[year]." So let's say there is no evidence of the exact day the batteries were installed. For example the only date you have is August 2006. Do you interpret that as the batteries will expire on July 31st, 2008 or August 31st, 2008? Quote Share this post Link to post Share on other sites
gweeks 1 #2 March 6, 2008 Got this from SSK: If a battery was installed in 08/06 it is good until the end of Aug. 2008. Always use the end of the month 2 years after initial installation. Quote Share this post Link to post Share on other sites
parafredo 0 #3 March 8, 2008 I would use the day of the month on the packing data card, nothing else. In event that the data card is lost, I would give until the end of the month Quote Share this post Link to post Share on other sites