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TonyMirtchev
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Re: Is the usable range applicable to all Li-Ion Batteries?
TonyMirtchev   8/23/2013 4:45:57 PM
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As far as I know the consumer electronic devices use the full capacity of the Li-Ion batteries in order to maximize the time the device can run on a battery. This is why it is typical for a consumer device battery to last about 2 years.

Cars have different requirements - batteries must last 10 years with 20% maximum drop is capacity. I own Chevy Volt and GM states that the actual battery capacity of my Volt is 16.5KW/h but the usable capacity is only 10.5KW/h.

Maybe in the future the laptop/smart phone manufacturers may give the consumer an option to select how much of the battery capacity to be used in order to maximize battery life. I am replacing my laptop battery every 2 years and even then during the second year the capacity drop is noticeable.

eewiz
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Re: Japan's hybrid lithium battery applications
eewiz   8/22/2013 4:03:15 AM
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spam post with hidden link for SEO. pls delete

eewiz
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Is the usable range applicable to all Li-Ion Batteries?
eewiz   8/22/2013 4:01:48 AM
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Intersting technical article. I have the question about the usable range. Is the 60% usable range applicable only to HEV batteries OR for all Li-Ion battery used in notebook/tablets/smartphones etc?

If true, then IMO manufacturers should mark down the efective capacity of the battery as 60% else it is intentionally misleading the consumers. 



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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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