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#8
12-31-2009, 10:09 PM
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Not sure which timers you currently have, but if they're the digital type, then the batteries (button battery) are only in there as a backup to keep the settings & time if there's a power failure. That way you don't need to reset the programming after a power outage. That's one of the reasons I prefer them over the mechanical types. The digitals might not work properly without a button battery installed, but that's just a matter of changing them once a year or so. If you have few power outages, they should last for a long time.
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Mike 77g sumpless SW DIY 10 watt multi-chip LED build  http://www.canreef.com/vbulletin/showthread.php?t=82206
Last edited by mike31154; 12-31-2009 at 10:12 PM. 
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