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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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atomic wris****ch battery Q
hello...
I have an atomic wris****ch that after a year or so acted like the battery was worn. Specifically, the EL backlight (when depressed) would cause the numerics to momentarily blank, and the clock to default to noon. After replacing the battery, it seemed fine for a few days, and the symptoms returned. Not suspecting anything, I bought a replacement watch by another company (it had a different marking) but worked identically. Again the year went by and the story was the same. I bought the CR1620 at Walmart, and even replaced that one within a week, and had this identical problem. So this brings me now here. I measured the current in 3 states: quiescent: 3 uA, actively radio syncing: 180 uA, EL backlight : 5mA When I used a AA 3 volt pack, the issue disappeared. Eveything was fine. I suspect the current draw essentially drops the voltage below a theshold, reseting the watch. But is this normal? Can a lithium button cell be expected to sustain a 5mA draw momentarily and not reset a watch? Or am I constantly finding poor quality lithium cells? Suggestions? Perhaps a source for "good" button cells? Les KA9GLW |
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