Laptop help


  #1  
Old 10-05-05, 03:53 PM
R
Member
Thread Starter
Join Date: Nov 2003
Location: Washington St.
Posts: 236
Received 0 Votes on 0 Posts
Laptop help

I have a HP DV4000 laptop. I do not have the manuals. Can I leave it pluged into the power source all the time or should I plug it in,charge the batt. then run it off the batt?
 
  #2  
Old 10-05-05, 04:51 PM
Davejb's Avatar
Member
Join Date: May 2002
Location: USA
Posts: 827
Received 0 Votes on 0 Posts
If you leave it plugged in all the time the battery will die a quick death, it needs to be cycled. Unplug it until you get a low battery warning then go back to A/C. My battery gets cycled once or twice a day, and is 5 years old and is just now getting to the point of needing replacement. I've seen brand new batteries go bad in 6 months due to being on constant A/C power.
 
  #3  
Old 10-05-05, 07:03 PM
S
Member
Join Date: Sep 2002
Location: Perry, MI USA
Posts: 36
Received 0 Votes on 0 Posts
battery type

Doesn't this depend upon battery type? Certainly with NiCd or NiMH this is true as they both suffer from the 'memory' problem. But I have read most places that the recommended procedure on the newer Li-Ion batteries is charge early and charge often.

Here is one example but I've read similar things on battery mfr sites.

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

From the article:

"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."

and...

"Simple Guidelines

Charge the Li-ion often, except before a long storage. Avoid repeated deep discharges."
 
  #4  
Old 10-06-05, 04:21 AM
R
Member
Join Date: Sep 2003
Location: Central New York State
Posts: 13,970
Received 0 Votes on 0 Posts
NiMH batteries do not suffer from memory issues.
 
  #5  
Old 10-06-05, 04:27 AM
Davejb's Avatar
Member
Join Date: May 2002
Location: USA
Posts: 827
Received 0 Votes on 0 Posts
Originally Posted by stratocaster7
"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."
The OP's question was about battery health when constantly on A/C power, the memory issue has nothing to do with that.
 
  #6  
Old 10-06-05, 04:41 AM
S
Member
Join Date: Sep 2002
Location: Perry, MI USA
Posts: 36
Received 0 Votes on 0 Posts
Originally Posted by racraft
NiMH batteries do not suffer from memory issues.
The effect is not a pronounced as with NiCd but they DO suffer from it. You can google 'NiMH voltage depression' and see what you come up with but it's just simple experience that taught me. They were originally thought to not suffer from this problem as you suggest but I think only the sales lit still claims that these days and the batteries can't read the sales claims :-).
 
  #7  
Old 10-06-05, 04:47 AM
S
Member
Join Date: Sep 2002
Location: Perry, MI USA
Posts: 36
Received 0 Votes on 0 Posts
Originally Posted by Davejb
The OP's question was about battery health when constantly on A/C power, the memory issue has nothing to do with that.
My response was more about your suggestion about cycling the battery.

Originally Posted by Davejb
Unplug it until you get a low battery warning then go back to A/C.
That is correct for NiCd and NiMH but doesn't appear to be the best recommendation for Li-Ion. That's all I was trying to point out. I agree that few or none of the batteries will last long when constantly being charged.
 
  #8  
Old 10-06-05, 04:56 AM
Davejb's Avatar
Member
Join Date: May 2002
Location: USA
Posts: 827
Received 0 Votes on 0 Posts
On paper it may not appear correct, but 5 years of service out of my Li-Ion battery in my Thinkpad tells a different story. Windows by default sends out a low battery alert at I think around 10% remaining by default, which is the setting I use, I did not mean drain it till it can't put out another ounce of power
 
  #9  
Old 10-08-05, 06:29 PM
R
Member
Thread Starter
Join Date: Nov 2003
Location: Washington St.
Posts: 236
Received 0 Votes on 0 Posts
Here is the text of HP tech supports e mail they sent me about battery in case anyone is interested. Mike

Thank you for contacting HP Total Care.
"I understand you concern about the usage of notebook while it is plugged
in or run it off on the battery power. Let me assist you in this
regard.

You can run the notebook continuously when it is plugged in with the AC
power adapter or run it off with the battery. If you run the notebook
either with AC adapter or battery continuously, it is not harmful to the
notebook or battery. Whenever, the battery reaches the maximum (100%)
charge, the power management installed on the notebook will
automatically controls the power to stop charging the battery and the
notebook power will switches to operate only on AC power adapter.

If you unplug the AC power adapter from your notebook, the power
switches on the notebook to battery power. Also, I would like to inform
that you can always the notebook on AC power. However, you have to
perform power drain and recalibrate the battery once in a week on your
notebook.

Please follow the power drain procedure to confirm the same:

1. Disconnect the AC Adapter.
2. Remove the Battery.
3. Hold the Power button down for 30 seconds to 1 minute.
4. Reconnect the AC adapter.
5. Turn on the Notebook power.

Recalibrating the battery:

Recalibrating the battery simply means recharging the battery to its
maximum capacity and resetting the battery gauge to display the level of
charge accurately. You may notice that the battery gauge does not
correctly display the battery charge level when you first receive your
Notebook or if you have not used your Notebook for a long period of
time. If the battery gauge becomes inaccurate, you must recalibrate
your battery.

To recalibrate the battery, complete the following steps:

1. Plug in the AC adapter.
2. Allow the battery to charge until the Battery Charge light turns
off, showing that the battery is fully charged.
3. After the Battery Charge light turns off, unplug the AC adapter.
4. Turn on or restart your Notebook.

NOTE: Steps 5 through 8 prevent your Notebook from entering Sleep
mode. These steps also allow the battery to drain faster.

5. Click Start and then Control Panel.
6. Click the Power Options icon to display the Power Options
Properties dialog box.
7. Click the Power Schemes tab and select the Portable/Laptop scheme.
8. From the Running on batteries column:

a. In the Turn off monitor drop-down list, select Never.
b. In the Turn off hard disks drop-down list, select Never.
c. In the System standby drop-down list, select Never.
d. In the System hibernates drop-down list, select Never.

9. Let the battery drain until your Notebook reaches Hibernation and
turns off.
10. Plug in the AC adapter and restart your Notebook.
11. Return to the Power Options Properties dialog box, and re-enter
your power savings settings to the desired level.

NOTE: Battery charging time will vary based on the initial
battery charge, the type of battery, and the activity of
your Notebook while charging. Your Notebook's batteries
charge much faster if the Notebook is off while charging."
 
  #10  
Old 10-09-05, 11:45 AM
Davejb's Avatar
Member
Join Date: May 2002
Location: USA
Posts: 827
Received 0 Votes on 0 Posts
Looks good on paper but doesn't work too well in practice. I've seen it time and time again, if the battery is kept at a constant full charge, it will go bad in 6 months to a year.
 
  #11  
Old 10-09-05, 01:21 PM
R
Member
Join Date: Sep 2003
Location: Central New York State
Posts: 13,970
Received 0 Votes on 0 Posts
Originally Posted by Davejb
Looks good on paper but doesn't work too well in practice. I've seen it time and time again, if the battery is kept at a constant full charge, it will go bad in 6 months to a year.
Sorry Dave, I have never seen a battery go bad simply because it wasn;t used. Laptop batteries go bad over time and have to be replaced. Newer ones work better, older ones not so well.

To the original poster, leave the adapter plugged in. It won't effect the battery at all.
 
  #12  
Old 10-09-05, 03:05 PM
Davejb's Avatar
Member
Join Date: May 2002
Location: USA
Posts: 827
Received 0 Votes on 0 Posts
I've seen many, and it's always the same story. Customer comes in complaining battery doesn't hold a charge, after questioning them I find the laptop has always on A/C for the last 6-12 months, they've never used the battery, when they go to use it for the first time, they get very poor battery life. It happens too often to chaulk up to manufacturing defects. But it doesn't matter, ultimately it's up to the end user as to what they want to do.
 
  #13  
Old 10-10-05, 03:05 AM
R
Member
Join Date: Jan 2005
Location: San Francisco Bay Area
Posts: 530
Received 0 Votes on 0 Posts
With Li-ion, there is no risk of overcharging. For safety
reasons, Li-ion packs are designed to never let an overcharge
condition occur

Yes, leaving Li-ion packs in like that shortens their life. But
that is not due to any overcharging! The constant high
temperature at a fully charged state is the real enemy.
 
  #14  
Old 10-10-05, 08:39 AM
Aegis
Visiting Guest
Posts: n/a
I don't know if this works for all laptops, but I can run my toshiba without a battery when it's on AC. I can guarantee it isn't being overcharged or overheated or subjected to repeated drains in this fashion.
 
  #15  
Old 10-10-05, 03:44 PM
Davejb's Avatar
Member
Join Date: May 2002
Location: USA
Posts: 827
Received 0 Votes on 0 Posts
The problem with that is on some laptops that use Speedstep, running the laptop without the battery will cause it to run at a reduced CPU speed.
 
  #16  
Old 10-11-05, 02:04 PM
Aegis
Visiting Guest
Posts: n/a
Fair enough, but checking the cpu speed via System Information is all that's needed to determine whether there's any reduction in cpu speed. Start->Run->"msinfo32" and you have an answer.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: