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Ann R. Thryft
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Re: Longer Lasting?
Ann R. Thryft   2/26/2013 5:31:36 PM
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Jack, that's not a spec or a standard, just a handle that immediately gives a picture of how long a battery charge lasts in a cell phone app, based on what the app is used for, in this case, talking. I suppose you could say "video watching time" if you had a battery-powered video player. I don't even know if the term is still in use. Back in the day I used to do the same kind of monitoring you describe on my Mac laptop, although it now comes with preset options for Battery vs AC Power, and switches automatically depending on whether it's plugged in.

Jack Rupert, PE
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Re: Longer Lasting?
Jack Rupert, PE   2/26/2013 4:37:49 PM
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Ann, I didn't know about the "talk-time" term either.  Is there a standard for calculating it?  I pay more attention to monitoring the battery hours on my laptop, so I know that there are a whole bunch of things that can affect that (brightness, software being run, communication devices, etc.).  I would think that there would need to be a certain standard combination of those types of inputs for comparison across products.

Ann R. Thryft
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Re: Longer Lasting?
Ann R. Thryft   2/26/2013 12:20:18 PM
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I think we could use a few different versions of "talk time" for other, non-cell phone apps, to indicate length of charge. Anybody know any?

warren@fourward.com
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Now we're talkin!
warren@fourward.com   2/26/2013 9:16:31 AM
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The weakness in any portable system is the battery. If you can recharge in 10 minutes, you have a winner. And they said nothing good ever came out of California...

Elizabeth M
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Re: Innovation is happening
Elizabeth M   2/26/2013 6:23:49 AM
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Yes, it would be great if they could overcome what you note is a long-time hurdle. This would be a great invention, particularly for the future of electric vehicles and could overcome any remaining hurdles to adoption. It's good to know at least that some very clever people are looking at the problem in new ways.

Elizabeth M
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Re: Longer Lasting?
Elizabeth M   2/26/2013 6:20:42 AM
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I didn't know that term, Ann, but it makes sense! Now I will know to use it when I am talking about cell phone batteries anyway and avoid any confusion in the future.

Charles Murray
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Re: Innovation is happening
Charles Murray   2/25/2013 7:16:57 PM
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Nice story, Liz. Let's hope this technology reaches its potential. Material scientists have tried many lithium-ion chemistries over the past 20 years and short cycle life has often been a problem. Lithium-sulfur, for example, has offered high energy but has had problems getting past about 50 cycles. Most automakers are looking for a minimum of a thousand cycles. Some are looking for 2,000 because they want some margin for warranties. Let's hope these engineers can do it.

Ann R. Thryft
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Blogger
Re: Longer Lasting?
Ann R. Thryft   2/25/2013 5:44:42 PM
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Thanks for posting this: potentially really good news. And yes, it's helpful to use two different terms for total lifespan and length of charge. In cell phone batteries, the latter is called "talk time."

TJ McDermott
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Re: Longer Lasting?
TJ McDermott   2/25/2013 1:32:39 PM
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And I should have said "at first glance" in my message.  You DID use two different terms: lifespan and longer lasting.

I'm with you, a longer-lasting battery with quicker charge will be VERY welcome.

Elizabeth M
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Blogger
Re: Longer Lasting?
Elizabeth M   2/25/2013 1:25:00 PM
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Yes, you're right, TJ...tricky wording there...It depends on what you mean as longer lasting. The battery will run out more quickly but it will continue to be charged and recharged longer, and apparently they are working on the design so it will eventually be longer lasting in both respects. Sorry for the confusion...I should have worded it more clearly.

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