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36 Posts

10-10-2008

Orlando, Florida

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9 Cell Battery Won't Go Past 97%

2008-11-14, 2:08 AM

I've had my W500 since 10/9.  Up until the last couple days the battery charges to 100%.  For the last couple days, it stops at 97%.  I have been using my battery a lot and I try to use the battery to a low charge below 20%.  I have always heard that you want to drain rechargeable batteries as much as you can to avoid "memory" problems.

 

Is this normal for the battery to do this?

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280 Posts

11-11-2008

Canada

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Re: 9 Cell Battery Won't Go Past 97%

2008-11-14, 2:18 AM

dudemanbubba,

 


Have you tried to fully discharge the battery and then fully charge it?
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John B @ forum.notebookreview.com
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36 Posts

10-10-2008

Orlando, Florida

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Re: 9 Cell Battery Won't Go Past 97%

2008-11-14, 2:30 AM
Is there a way to fully discharge it other than running the computer till its done?
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9380 Posts

11-27-2007

Slovakia

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Re: 9 Cell Battery Won't Go Past 97%

2008-11-14, 7:06 AM

dudemanbubba wrote:

I've had my W500 since 10/9.  Up until the last couple days the battery charges to 100%.  For the last couple days, it stops at 97%.  I have been using my battery a lot and I try to use the battery to a low charge below 20%.  I have always heard that you want to drain rechargeable batteries as much as you can to avoid "memory" problems.

 

Is this normal for the battery to do this?


 

This is quite normal, see here

Andy  

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52 Posts

10-21-2008

Nova Scotia, Canada

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Re: 9 Cell Battery Won't Go Past 97%

2008-11-17, 14:10 PM

wrote:

...I have always heard that you want to drain rechargeable batteries as much as you can to avoid "memory" problems.

Is this normal for the battery to do this?


Not so with Li-Ion type batteries in today's laptops

 Quoting from http://www.buchmann.ca/Chap10-page6.asp

"The Li-Ion batteries prefer a shallow discharge. Partial discharges produce less wear than a full discharge and the capacity loss per cycle is reduced. A periodic full discharge is not required because the lithium-based battery has no memory. A full cycle constitutes a discharge to 3V/cell. When specifying the number of cycles a lithium-based battery can endure, manufacturers commonly use an 80 percent depth of discharge. This method resembles a reasonably accurate field simulation. It also achieves a higher cycle count than doing full discharges"

 

This "book" makes an interesting read. I had shared your opinion of batteries when I bough my A21e thinkpad some 8 years ago, and always discharged to or close to Zero everytime I used the battery, thinking I was doing good (A earlier laptop battery types, this many, indeed have been correct).

 

When my new W500 arrives, I now know  better, and will aim for more shallow discharges - though there is still a "shelf" life, used or not. This "book" also offers some good advise on storage if the battery is not to be used for an extended period

 

JimL

JimL
W500 4085CTO Vista64/8GB/Solid Non-Flex keyboard
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