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Take battery out when charged?

post #1 of 8
Thread Starter 
I keep hearing different things about maintaining the battery. Should you, or should you not do this? This is kind of a hassle, but I want to prolong my battery's charge capacity. I have a 4 year old Dell 1505 that I haven't been removing the battery from when it is full, and I am using the AC line, but it's charge is still very, very good. Advice? Both my Dell 1505 and current eee Pc hace Li-ion batteries I believe. Thanks in advance.
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post #2 of 8
Still mixed reviews on whether or not it's necessary. I know I left my laptop plugged in a lot when I first started college, and now the battery doesn't even last 5 seconds on a full charge. So, with my new laptop, I just unplug it once the charge is full, and don't plug it back in until it's telling me it's about to cut off. Been working great so far.
post #3 of 8
Thread Starter 
Any advice one way or another about charging the battery to 100%? Also, what's the min level the battery should drain to before a recharge?
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post #4 of 8
OK 1st Merry Xmass to all. Was a thread like this last week and will be another next week. Almost always respond as I too once wondered also. This response will mix fact with opinion. When I say what I do or don't do opinion when I don't it is fact.

All Li-Ion battery's start to lose the ability to hold a charge from the day they are made. It cannot be stopped, it can be slowed.

Big O I understand your comment about still out as to what is best to do. I will agree it is still out. I will tell you it will never be in because peoples usage and needs and opinion will not ever allow a one size fits all answer. I will expand on that later. But BigO you are doing the absolute worst things you can do for a Li-Ion batt. Li-Ion batts have a limited number of charge/discharge cycles (full, 2X50%=1 full). You are needlessly wasting yours. Also since you are keeping the batt in you are doing nothing abut the heat concerns. As said you are doing the worst you could do.

To OP your battery cannot over charge or under charge unless there is mechanical failure. Longterm storage at 40% to 50% at 40F will prolong life vs higher charge or higher temps. Is that practical? intentionally running down to 40% to 50% every night will likely have a larger negative effect on batt life because of limited number of charge cycles being used than the higher charge level or heat would of caused.

If you use your batt periodically likely better to keep in and keep charged. You use as needed there is no need to discharge to a certain level before recharge. Also no reason to not stop charging before full charge. Li-Ion batts do not suffer "memory effect".

There are applications that will stop charging prior to 100% charge. Most I think 80%. Well if you understand the limited number of cycles (full) what they show as some kind of improvement is not. Going from 80% to 30% then charging is not a full charge. It is 1 half cycle that is why you will get more cycles. Because they are half cycles. Understand this arbitrary strategy in no way helps real world. I mean if I use my flash light 1/2 hr a day vs 1 hr a day of course it will last twice as many days? But what is the gain? None, same with some of these half baked strategy's.

BatteryU and Battery guide at NBR are two of the more informative places for info.

The choice is really keep in the fridge at 40% charge and never use? Will last longer. Or just use it when needed, do not intentionally discharge it does you no good. 100% is fine your notebook battery cannot over charge.
Edited by Asus Mobile - 12/25/08 at 7:57pm
    
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post #5 of 8
Apparently it doesn't affect anything on most laptops, except on Macs, there seems to be a ~30% decrease in performance when you take out the battery.
I'd just leave it in always if I were you.
    
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post #6 of 8
Lithium Ion batteries start to lose capacity the second they are created. They do not need to be drained or used and they will still lose the ability to hold charge over time. Things that accelerate their loss of capacitor is high temperature, a near full charge, and a near empty charge.

The best thing to increase the longevity of a lithium ion battery would be to charge it to 30-50% capacity and keep it in a cold place.
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post #7 of 8
Quote:
Originally Posted by pauldovi View Post
Lithium Ion batteries start to lose capacity the second they are created. They do not need to be drained or used and they will still lose the ability to hold charge over time. Things that accelerate their loss of capacitor is high temperature, a near full charge, and a near empty charge.

The best thing to increase the longevity of a lithium ion battery would be to charge it to 30-50% capacity and keep it in a cold place.
I do not disagree with what you say as it is all fact. But what is in bold. If I took those measures I might as well sell on Ebay as it is completely impractical in the real world for most users even impossible for others to achieve.

Yes fully charged longterm storage does lower the capacitance. The low charge storage as far as I know is a voltage drop below the safe level. That will not lessen the batts life, it will kill it.

On the last points. I have concern people will think charge to 80% discharge to 30% will prolong life? Well they test and the batt gets 600 charges. Full discharge/charge only gets 300 charges. Well those numbers are the same. I have seen the tests. They are flawed. 300X1(full ischarge/charge)=300, 600X.5(30%/80%)=300. The real measurable difference is a <5%.

Best way to make car tires last forever is to not use them. How come when I say that people think I am an idiot? But talk about batt's and common sense is out the window.
Edited by Asus Mobile - 12/25/08 at 11:40pm
    
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post #8 of 8
Quote:
Originally Posted by Asus Mobile View Post
I do not disagree with what you say as it is all fact. But what is in bold. If I took those measures I might as well sell on Ebay as it is completely impractical in the real world for most users even impossible for others to achieve.

Yes fully charged longterm storage does lower the capacitance. The low charge storage as far as I know is a voltage drop below the safe level. That will not lessen the batts life, it will kill it.

On the last points. I have concern people will think charge to 80% discharge to 30% will prolong life? Well they test and the batt gets 600 charges. Full discharge/charge only gets 300 charges. Well those numbers are the same. I have seen the tests. They are flawed. 300X1(full ischarge/charge)=300, 600X.5(30%/80%)=300. The real measurable difference is a <5%.

Best way to make car tires last forever is to not use them. How come when I say that people think I am an idiot? But talk about batt's and common sense is out the window.
I was not suggesting that was what you should do. Instead I was simply stating what conditions would result in maximum battery capacity longevity. If you know what conditions would result in maximum performance then you know what actions will benefit you battery life in anyway.

If I were to tell you that freezing your battery to 0C would result in maximum performance then that would indicate that 15C would be better than 20C and 25C is better than 30C.
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