does always having laptop running oc AC ruins battery life

i have lenovo g550 laptop.I want to know that
(1)if i let charge my laptop for 24x7 ,without removing battery...
(2)when battery is 100% charged,remove the AC ,and again charge until battery is discharged.
which one should i prefer?
if (2) then after how much(90% or 10%) discharging the battery,should i charge it again?

 

Yes, having the battery in with the AC 24/7 will ruin your battery much faster.

What is optimum is to fully charge it once a month and use it to 40% charge or so. Remove it and use the computer on AC. In a month's time, insert the battery and charge it fully. Then, once again use it until it is at around 40% and remove it till next month.

The reason you don't want to discharge it more than around 40% (before storing it, or unless you're charging it up in the next couple of hours) is that if the energy is totally depleted in a batteries cells, then they may actually reverse the charge they hold and they will never be able to charge up again.

Good luck.

 

If you're frequently on/off battery power, I'd leave it in. At one point I was only on battery power two or three times a week and would leave the battery out while on A/C. The one time I forgot, I unplugged and lost the last 10 mins or so of work and slightly corrupted some unimportant files. Just don't forget if the battery is out, and trust me, at least once you WILL forget.

It does wear faster if it's left in on A/C, but for me, the guarantee of power is more important than saving a little wear on the battery. The desktop and electronics in my home all run on a UPS, and ultimately my laptop battery acts as the backup power while a beefy surge protector handles bad power.

The 40% storage charge is mostly intended for long-term storage, in which case you should also stick it in the refrigerator to lower the temperature as much as possible. But if you use your battery often, leave it at 100% for usability purposes.

And never ever let the battery go down to zero. There's a slight reserve charge that you can never intentionally use, but if you store the battery at 0%, natural wear will eat into that reserve and trip protection feature that will make the battery unusable in the future.

 

With my 3810t I used it a lot on AC, always removed the battery. To this day the battery is still around 97% with very little wear.

 

When did you get it? To say "to this day" without anything more could means you lost 3% since yesterday...

 

http://forum.notebookreview.com/har...et-upgrades/91846-notebook-battery-guide.html

 

I got my 3810t in July 2009, my parents use it now.

 

With my SZ i've nearly always used it plugged into the AC. This laptop is 28 months old and the battery wear is still showing at 0%. I did use it on battery for about a 5 months in 2008-2009. After that i did though start to cap my battery at 80% and then later on 50% no doubt that has helped a bit.

Does Lenovo not provide any battery care software?

 

I believe Lenovo, like some Sony and Samsung laptops offer the option of not charging over 80%.

 

basically i do option 2... however i discharge only till 15-25% before recharging... my wear level is 10% after a few months but from factory it was already 5%... can't complain as it was a free battery

 

thanx guys for help..

 

Which means it's really of no consequence to the average user--since most people use their batter.

On the other hand, if your business is laptops/batteries, then you'll want to use every suggestion to prolong battery life, and thereby maximize your profit.

 

to calibrate the battery do you just run it down til windows turns off at 5% or do u go lower? i think my battery wear estimates may be off, never done a full discharge/charge on the batt... also, is it a bad idea to only charge to like 50% instead of 100%? sometimes i dont have time to get it full lol

 

5% is enough.

Charging till 50% is no problem. If you rarely charge above 80% it extends battery life.

 

so its beneficial to not charge it to 100%? never knew that thanks

 

That's not what he said; and neither is that a logical conclusion. Rather, he suggested some of a variety of battery extending solution that are available--the idea here is to use the ones that work best for you. Consider a useful life of around 500 cycle,s to be in the good range.

 

ok ...thanx buddies..

 

Several companies like Lenovo, Sony and Samsung offer a setting where the battery never gets charged over 80%. They say it extends battery life.

 

probably extends it cause 4 full charges is = to 5 charges at 80% so every 5 charges u gain 1 more cycle

 

I don't think that's the reason. I believe charging to 100% or discharging to 0% creates extra stress for the li-ion cells.

 

Never? What kind of sense is that supposed to make? If that were true, I would only ever have at most 80% of the stated capacity available. I assume there is a way to fully charge the battery if needed, right?

 

It's not usability that's the issue, rather, extending battery life. Although I understand the impracticality of such a suggestion, if we were to continue down that route, not using the battery at all would extend it's life even further. How about that for maximizing battery life?

 

my original battery lasted only 5 months by charging then using down to 10%. i have a new battery now and keep that mostly charged in the drawer and only use it when i travel (not really that much)
almost always i am on ac with the original battery which only lasts about 10 mins now but as woofer00 says, it provides a good backup if the power goes.

 

Yes the feature can be disabled.

 

i totally agree with this but IMO, charging to 100% and discharging to 10-25% should be ok.. anyways , the battery should nver be discharged to 0% really speaking unless u want to loose ur data.

mine lasted a year but i guess it was the quality of the battery... the one i'm using now only has 10% in 5 months although it had factory wear of 5%...
The quality depending on brand is also problem.. IMO , Acer Hp and sony batteries are crap.

 

The brand names are your assurance of quality. However, it by no means is the only thing you need to be aware of for battery longevity. In fact, all of the aforementioned, suggestions can have an effect on how long your battery last. Nevertheless, neglecting any one of them can (or leaving it in a hot car for too long) can shorten a batteries life irreparably. With that in mind, you may never whether if it was poor workmanship, or something you did wrong.

 

You do know that those companies don't make their own batteries right? Just like all other ODMs, they get parts from similar suppliers (this even extends to pretty much all components too, like motherboards, screens, etc). My Acer battery has lasted almost 3 years with <10% wear. I keep it in my system all the time and use it from 100% to 10% at least weekly. Blanket general statements rarely are true and don't really help discussion...

 

if you're going to store batteries in the cupboard for a while, it's best to store at 40%

storing batteries at 100% for an extended period of time is a bad idea and will actually wear out the battery much quicker. this is probably the reason for the 80% option in some laptops. the issue is not apparent during use (since it does not stay 100% for long) however keeping it charged at 100% during use will cause a much quicker wear.

these guys explain it much better than i ever could.
How to prolong lithium-based batteries

but in short, yes storing batteries at less than 100% will lengthen the life of your battery. storing in a relatively cool (or cold) place at 40% charge is optimal for longetivity but not practical. reducing the max charge while using on AC adapter makes sense and 80% is a good compromise between longetivity and practicality.

 

In fact, it pretty much extends to everything manufactured. Nevertheless, the brand name implies a level of quality no matter how many ancillary manufactures provided parts to it's final construction.

 

At the same time, control is out of their hand most of the time. Just take a look at battery recalls, nVidia 8x00M series recalls, etc. ODMs rely on these companies and they won't do extensive testing on each companies' products internally due to cost, so they need to trust them to deliver a solid product.

 

The mistake they make when they put their name on a product. It's like an endorsement: If the person representing your product screws up, it can reflect badly on their sponsor. Even though they don't control every aspect of their lives. In the case of ball teams, they have a lot more say (via the contract) on how the athlete behaves.