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ehat
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re: Silicon Valley Nation: 30-year battery life? Really?
ehat   12/12/2012 1:23:47 PM
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Radio Shack EC-4028 Calculator bought in ~92-93. Changed batteries in 8/12. Didnt have to but the screen was getting a little light.

daustins
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re: Silicon Valley Nation: 30-year battery life? Really?
daustins   12/12/2012 4:17:34 PM
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In 1981 I got a Casio hand calculator: LCD display, running on one AA battery. I never turned the power switch off. I used it daily for a decade and after 25 years found it, and it was still functioning. Under a quarter century of grime. I recall over 30 years ago when the first chip was released for flashing an LED with a very short duty cycle. It was postulated that the batteries (way before Lithium-ion and when NiCad was the Gold Standard) would last longer with a very slight current drain. It seems they were right.

davewooff
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re: Silicon Valley Nation: 30-year battery life? Really?
davewooff   12/12/2012 4:26:20 PM
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Not sure about longest lasting battery but it always makes me smile when I see a single AA battery quartz clock on a wall struggling to overcome gravity with the big hand stuck at about 20 minutes to the hour still ticking away.

RogerAW
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re: Silicon Valley Nation: 30-year battery life? Really?
RogerAW   12/12/2012 5:09:39 PM
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Today is the 21st anniversary of our 2 Sharp EL-506H calculators which are still running on their original batteries.

IDontUseTheForumSoWhyAmIForc
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re: Silicon Valley Nation: 30-year battery life? Really?
IDontUseTheForumSoWhyAmIForc   12/12/2012 5:40:20 PM
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When a quartz clock can no longer keep the arms moving its time to finally retire the battery. When I have a remote control or other device with an (allegedly) dead battery, I save it for use in the wall clock. I can usually get another couple months of power using the battery in the clock before it finally 'gives up the ghost'

bkeller137
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re: Silicon Valley Nation: 30-year battery life? Really?
bkeller137   12/12/2012 5:57:03 PM
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Across the hall from me, my colleague has an hp-15C calculator that he has had since college 25+ years ago that is still going on the original button batteries. He does only use it a few times a month on average, but still, that is a long time.

Brian Fuller2
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re: Silicon Valley Nation: 30-year battery life? Really?
Brian Fuller2   12/12/2012 6:36:09 PM
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Separate application, but my father bought a Sony transistor radio in the 1960s... one of the earliest. We still have it. It still works like a charm. We listened to some historic events on that thing...

Battar
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re: Silicon Valley Nation: 30-year battery life? Really?
Battar   12/13/2012 7:36:59 AM
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My 1988 Fluke 73 DMM lasted a very long time on its' original battery. A Casio digital watch also lasted nearly 10 years on its' lithium coin cell. Most batteries now would self discharge before then.

matthew43
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re: Silicon Valley Nation: 30-year battery life? Really?
matthew43   12/13/2012 5:06:45 PM
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I have a HP-15C calculator and a HP-12C. I haven't used them much in the last 7 years but when I pulled them out they still work. I didn't buy either one new so I can't tell you how old the batteries are except they are both more than 7 years. Some SOB stole my HP-15C about 12 years ago so I had to buy one on eBay. Why would an EE use any other calculator?

K1200LT Rider
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re: Silicon Valley Nation: 30-year battery life? Really?
K1200LT Rider   12/13/2012 5:21:56 PM
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I'm afraid to leave common, alkaline batteries in anything nowadays for very long without regularly checking them. I have had so many things destroyed when they leak and/or grow the white chemical "fuzz". It's really frustrating. Do modern-day batteries do this more than they used to?

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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