kb...@n1k.org said: > The numbers quoted earlier (and they sound right) were 20 uA at 2.5V. That > would be well under your 100uA. My *guess* is that self discharge / aging on > a normal AA is going to limit things faster than a 20 uA drain.
20 uA would last 15 years. (assuming no self-discharge) Self discharge is temperature dependent. Graph here: http://data.energizer.com/PDFs/alkaline_appman.pdf (poke the shelf-life button on the left) At 20C, alkaline lose 20% in 10 years. Or roughly 50 years for the whole thing. (assuming linear and waving my hands) > The UT+ data sheet from 1998 quotes an external backup supply of 2.5 to > 5.35V with a drain of 5uA typical at 2.5 Volts. Ahhh. That would be 60 years. (assuming no self-discharge) So it's roughly matching the self discharge rate. kb...@n1k.org said: > Your pair of AAâs will start off at 3.1V, but they will get to 2.5 long > before they are truly dead. Is the RAM gone at 2.5000 or 2.4 or âabout 2 > voltsâ â¦. The usual cutoff is 0.8 V. It falls off quickly at the end. It's still 50% at 1.25 V. There is a graph at the above URL. -- These are my opinions. I hate spam.
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