Battery Life on a new vs old battery

Hi I've just bought the HP Pavilion g4 (1100au) and ran the battery check utility.
I noticed that the battery is already 6 months old. How does this affect the life and capacity of the battery? And will the warranty cover the fact that the battery is already 'old' at purchase? (E.g. if it's below expected performance for a 1 year-old battery one year after purchase, will the warranty replace the battery?)
Although there is no mention on the HP site, some online stores selling HP Pavilion are claiming a battery usage time of just over 4 hours (not using dvd drive or playing graphic-intensive games). Is this correct? What should I expect in a year's time, in 2 years' time and in 3 years' time?
many thanks
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Any site about battery life and usage will tell you that it depends on the number of charge cycles and the level of charge that you keep the battery at.
If you keep a battery at 100% it will decrease the life significantly. That's why a new battery will ship with a charge of say 50% or 40%.
Getting 1000 cycles or even 500 cycles out of a Li-ion battery is overly optimistic, at best. Older batteries would degrade over time until the MAh would go to 0. They would also heat up during charge cycles and have minor shorts in them which would be disregarded by the battery board. A short in a battery is a major problem.
Nowadays, batteries have smart chips in them, a temp monitoring diode, lots of safeties. If the smart chip detects the smallest defect in a battery, it will just shut it down. That's why you see seemingly good batteries just all of a sudden stop working. Once the Mah rating gets down to about 50%, a battery could just shut down at any time.
Aftermarket batteries don't have these safeties built-in to them. Most of them don't even have a temp diode. They just show a static temp all the time. So, they could short out and start a fire, they could overheat and take out your laptop charging system or worse. I've seen worse, it's not pretty.
I don't do anything to increase the life of my batteries, I just keep them at 100% charge and use them. I'm lucky if I get two years use out of a battery. Usually I get one to one and a half years out of them. After about 100 charge cycles, they start to degrade the mAh rating. If they make it to 50% without shutting down, I just replace them.
Batteries aren't even considered a component anymore, they're considered a disposable commodity.
Dave
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NC4400, TC4400 Win 7 Ultimate, xp pro, both dual boot
a bunch of thinkpads

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Save and Protect your iPad Device: How to Save and Prolong the battery life of your new ipad

Please, as you read add more answers to this on how to prolong and save your ipad battery life. Thank you
Saving the battery life of your iPad
1.Keep Your iDevice Out of the Sun
Whatever you do, don’t leave your iPhone or iPod sitting in a hot car—heat kills batteries faster than any other factor, and your device that used to keep a charge for hours will eventually barely hold a charge, and you’ll have to pay Apple to get it replaced. The same thing holds true for any really hot environment: try and store your device in a cool place.
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If you’re busy spending the next 8 hours playing Angry Birds, there might not be a good reason to have internet access, so you can consider using Airplane Mode, which turns off both Wi-Fi and the regular wireless radio. Of course, this will prevent phone calls if you’re on an iPhone—but if you’re busy with Angry Birds you probably don’t want the interruption anyway.
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<Edited by Host>
Irem Bright writes and would love your own addition if you got other helpful tips.
Thank you all.

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Hi,
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Note:
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**Click on “Kudos” Star if you think this reply helped** Or Mark it as "Solved" if issue got fixed.

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Message was edited by: crickbits

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In particular read the article on calibrating the battery. If you haven't done this, then I suggest you try it first. If problems persist then followup with a call to AppleCare or your local Apple retailer.
About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
Determining Battery Cycle Count
Calibrating your computer's battery for best performance
Battery University

Battery Life on a new vs old battery

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