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#1
posted to rec.boats.cruising
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LION laptop batteries
What is the best way to maximize Lithium Ion battery life in laptop
computers? Should the computer just be plugged in whenever possible while it is used or should it be run on the batteries down to some optimum battery level and then recharged? How does deep discharge effect these batteries? Morning Larry. -- Roger Long |
#2
posted to rec.boats.cruising
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LION laptop batteries
On Mon, 29 Sep 2008 07:28:56 -0400, Roger Long wrote:
What is the best way to maximize Lithium Ion battery life in laptop computers? Should the computer just be plugged in whenever possible while it is used or should it be run on the batteries down to some optimum battery level and then recharged? How does deep discharge effect these batteries? Morning Larry. Lithium Ion batteries don't have a memory, so several partial discharge/ recharge cycles are better than a complete discharge. Also, if you are going to leave it plugged into AC, it's better to remove the battery as heat is a problem. |
#3
posted to rec.boats.cruising
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LION laptop batteries
I think this little Asus Eee PC 900 must have a pretty good charger. Even
plugged in all night, the battery doesn't get warm. I'm reluctant to take the voltage smoothing capacity of the battery out of the system; especially with the less than perfect AC from a small inverter on a boat. -- Roger Long |
#4
posted to rec.boats.cruising
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LION laptop batteries
On Mon, 29 Sep 2008 10:12:05 -0400, Roger Long wrote:
I think this little Asus Eee PC 900 must have a pretty good charger. Even plugged in all night, the battery doesn't get warm. I'm reluctant to take the voltage smoothing capacity of the battery out of the system; especially with the less than perfect AC from a small inverter on a boat. But does the CPU? The heat from a CPU could be a problem to battery longevity. Then again, you may have a point about the inverter. |
#5
posted to rec.boats.cruising
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LION laptop batteries
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#6
posted to rec.boats.cruising
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LION laptop batteries
On 2008-09-29 12:39:50 -0400, Wayne.B said:
When I'm on the boat with our laptops I leave them plugged in, and in suspended state when not in use. They use minimal power that way and generate very little heat. The battery stays charged and everything is ready for immediate use. Where the power usage isn't a factor, I agree with this. My desktops for the last decade or two have been on 24/7. At work, my machines typically have fewer problems that can be blamed on the thermal shock of being turned on each workday. -- Jere Lull Xan-à-Deux -- Tanzer 28 #4 out of Tolchester, MD Xan's pages: http://web.mac.com/jerelull/iWeb/Xan/ Our BVI trips & tips: http://homepage.mac.com/jerelull/BVI/ |
#7
posted to rec.boats.cruising
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LION laptop batteries
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#8
posted to rec.boats.cruising
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LION laptop batteries
"Roger Long" wrote in
: What is the best way to maximize Lithium Ion battery life in laptop computers? Should the computer just be plugged in whenever possible while it is used or should it be run on the batteries down to some optimum battery level and then recharged? How does deep discharge effect these batteries? Morning Larry. -- Roger Long Lithium Ion batteries are just like your house batteries....float batteries. They should be plugged in at your earliest opportunity and NEVER left in a discharged state for any period you can help. There is only one condition that happens to them where they should be run down as far as the onboard IC controller inside the battery pack will allow, which is by the way about 50% of total charge..... The IC controlling the charge/discharge cycle is incapable of understanding the drift in the charge state caused by Lithium oxidation over time. So, the IC gets "out of sync", so to speak, with the true charge state of the battery. When this happens, because of the way it happens, the IC cuts the discharge off prematurely high above the allowable discharge floor it is designed to set. The procedure to restore its sync is very simple. Run the device until the IC shuts down the device telling you the battery is discharged. Wait a few minutes and run it down again, teaching the damned IC a less about who is in charge, here. That runtime will be quite short. THEN, IMMEDIATELY, plug the device into its charger and do a FULL CHARGE. The IC will automatically note its mistake and allow the charge to reset the IC's memory. I do this procedure on my devices about every other month. Some of my Li-Ion batteries are 5 years old and work fine, including the $130 one in my Gateway laptop that's capable of cranking a diesel. The rest of the time, simply plug the device into its charger at EVERY opportunity, even if it has only been discharging for 10 minutes....The IC controls the charge. You cannot overcharge a Li-Ion device! The charge-full light will simply come on quite fast. You can leave the laptop power supply plugged in PERMANENTLY without damaging the battery pack. Mine has been plugged in for years. Hope this helps. I've been a bit busy today trying to recover from the Wachovia Bank crash without having to deal with FDIC or the new owners. I got my money out even before the bank's own employees found out about the crash this morning, moved my money to Community Firstbank of Charleston, a locally owned bank company whos CEO is a SAILOR! John owns a nice new Beneteau Sloop that walks by the Amel Sharki in any cruiser race like we are parked. It's his company and I feel much safer personally knowing the CEO. Of course, that meant moving my Direct Deposit Socialist Security, Autopay accounts for power/internet/sellphone over to the new account.....a good day just wasted. But, tonight, I feel a little more secure. This little bank makes a nice profit and doesn't loan money to people who can't repay...very carefully.... Besides, they gave me a nice new red backpack with a built-in beer cooler in the bottom to match my scooter!....(c; Oh, and one of those waterproof plastic document boxes with the O-ring seal that floats and has a lanyard to store my documents in on the boat.... .....They don't have toasters, though, I noted....(c; |
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