09-06-2010 07:38 PM
Just got a new X201 to replace my Z60t. My Z60t battery had to be replaced 3 times. I found that if I removed the battery when at home for long periods, only charging it before leaving and when in the road, the battery lasted much longer.
Do I need to do the same thing w/ my new 9 cell X201 battery?
Will the X201 battery last even if it is under constant charge will home on the UltraBase for long periods of time?
Appreciate your help, Beachguy
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09-07-2010 02:59 AM
go into your battery maintenance tab in your Thinkvantage Power manager, set the custom charging behaviour. to start charging below 70% and stop at 95%, this will minimise top up charging, which usually kills the battery prematurely.
09-07-2010 04:16 AM - edited 09-07-2010 04:53 AM
I have yet to see proof that Lithium Ion batteries benefit from setting them to not charge to 100%
I have noticed lithium batteries that are on the charge for long periods after they reach full charge tend to have shorter life spans I have no idea why.
It may have something to do with the fact lithium batteries are also extremely heat sensitive this also reduces the battery life span and they tend to get a bit warm after being on the charge for a while.
One thing you probley don't know is lithium batteries begin to degrade from the time they are made, hence manufacturing dates are very important if a lithium battery is left on a shelf for a year without use it will have a reduced lifespan. If a lithium battery becomes completely depleted the battery is dead hence it is not wise to constantly use them until they become flat. The lithium battery continues to use charge even when it is disconected from your laptop there is a chip that monitors your battery temperature and ballances the charge between the battery cells.
Here is a link to some more in depth information about Lithium batteries including why Lenovo and other manufactures batteries were catching fire http://electronics.howstuffworks.com/lithium-ion-battery.htm
All in all lithium batteries are extremely dangerous particularly when they are not manufactured well and there are very few people who can give you definative information on how best to make them last.
The best you can hope for is that the quality has improved that they don't explode get hot and catch fire and the cost be forced down to realistic prices when the time comes to replace them. Considering they often only have 12 month warranties and tend to break on people more and more these days.
09-07-2010 05:42 AM - edited 09-07-2010 05:44 AM
Go and purchase a subscription to ScienceDirect and ProQuest... and start reading.
HowStuffWorks is not the final say in this sort of thing.
Read this article:
'Study of the charging process of a LiCoO2-based Li-ion battery'.
This should clear up your misunderstandings and misconceptions. Also, all battery loses charge due to entropic process, just like unprotected steel will rust if left on its own, and not all Li-ion battery got an active monitoring safety switch that stays on even when the battery is left by itself (most of the generic knockoff battery don't have one).
09-07-2010 05:12 PM - edited 09-07-2010 05:25 PM
Misunderstandings and misconception....? Im the first to agree there is alot of conflicting information on how best to prolong the life of lithium batteries.
I unlike you am at least willing to admit that you should be wary of the word "definative proof"
After all It is not very hard to find people who disagree with the fact you state "you should not top up charge your battery it will reduce the life of your battery significantly"
Here is one quick referance about lithium batteries
Mostly informs about manufacturing dates and to remove your battery when your on AC power
And I have not yet found "definative" proof that recharging to 100% is a bad thing but I will read your article I will however post this article from (Isidor Buchmann is the founder and CEO of Cadex Electronics) on how to prolong your Lithium laptop battery.
"Battery experts agree that the life of lithium-ion depends on other factors than charge and discharge rates. Even though incremental improvements can be achieved with careful use of the battery, our environment and the services required are not always conducive to achieve optimal battery life. The longevity of a battery is often a direct result of the environmental stresses applied"
09-07-2010 06:25 PM
Wish there was a way to mark "heretohelp's" reply extremely helpful.
Its actually NOT extremely helpful IMO, and I suggest that you be wary about following the advice as it is very generic in nature and relies heavily on truisms, while containing few facts which appear to be relevant to Lenovo's Lithium battery technology implementations in any useful way.
09-07-2010 07:10 PM - edited 09-07-2010 07:13 PM
So CEO of Cadex Electronics is suppose to be final word on battery technology (also i think many CEOs are selected based on how they manage the company and produce profit returns for the investors, they may not even have the educational background in these sort of electrical engineering field)?
So referencing and posting some generic guidelines is suppose to be last word on li-ion battery technology? At least use some peer reviewed journal articles and not some secondary information sources from the web.
09-07-2010 11:55 PM - edited 09-08-2010 05:32 AM
You guys want to get into a fight with me about ultimate truths and definative answers I have already stated that the closer you look the more conflicting answers you get about the specifics in extending the life of your batteries.
I found these general tips to be very helpful in exposing that environmental conditions and the age of your battery have as much if not more impact on the longevity of your battery as how you adjust your battery management software settings.
With that said I have in some publications seen some information in regards to not charging your battery to 100% my issue with it is its not definative proof but as far as I know it gives you less charge hence less battery time, But rewards you with more battery cycles. So I get your point but If I told you that you can get more miles out of your tires by not driving your car you would be less inclined to think it rewards you with any real net benefit.
As for the credability of the CEO of Cadex electronics Isidor Buchmann Im more inclined to take the word of a CEO of a company who has a vested interest and specialisation in charging and keeping my lithium batteries in good condition. Than Lenovo or battery companies who have a vested interest in only making sure my batteries pass the 12 month warranty period.