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Laptop battery characteristics

by Hesston / December 17, 2004 11:22 AM PST

What is difference between full charge capacity and design capacity. Can it be that a battery is only 75% of what a new battery would be. And the charge showing 100% is actually a full charge of the 75% capacity that the battery has diminished to.

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It's not accurate.
by R. Proffitt Forum moderator / December 17, 2004 10:17 PM PST

Never has been. Some get a little irate that 50% may not get them an exact number of minutes or indicate that so many mAH of battery power is available.

Again, it's a gross indicator. About as accurate as the gas gauge in your car.

You also ask "Can it be that a battery is only 75% of what a new battery would be." This is the old battery issue. NiMH and LiON batteries lose some capacity with each charge. So an old battery will show a full charge but in reality be some percentage of mAH that a new charged battery is.

There is no maker that does this any different. In case you ask...

Bob

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Thanks for prompt and informative reply
by Hesston / December 18, 2004 2:17 AM PST
In reply to: It's not accurate.

As usual your information and diagnosis is right on.
You are remarkable considering the lack of information we dummys supply in our posts. Thanks Again

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The only ____ question is the one ...
by R. Proffitt Forum moderator / December 18, 2004 2:29 AM PST

We didn't ask.

As an electronics designer, the most perverse thing I got to do was to estimate how long a battery would last in some product.

You may find it interesting as it is much like the story about "How far does this rabbit hole go?"

Factors include what the device is doing at the time, if there are LEDs on it that are on, if there is some audio output then what the volume is as well as what is the song being played. I've never found the right answer since the temperature, usage and battery discharge curves are never the same. So my numbers always were given from the pesimisstic to the optimistic and what was in the middle was never told since no one ever got that number. In the end, you'll see vague times like "over 1 hour" or whatever you see.

It is truly an area I don't like working in because the answer can never be proven by testing.

If you found that answer useful, then that's good.

You're welcome.

Bob

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