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18.09.2014
Note that this warning was added in Windows 7, so you won’t see it if you’re using Windows Vista or XP. If you’re curious just how far your laptop’s battery capacity has declined, you can use a third-party tool to view it.
For example, in the below screenshot, we see that the battery was designed to hold 86,580 mWh of energy. Some batteries may display more information, such as the number of charge and discharge cycles they’ve been through.
After we calibrated the battery, Windows stopped warning us and the battery’s reported capacity went back up to 70.8%.
To make your laptop’s battery last longer, read our explanation of battery life myths and facts to know what works and what doesn’t. If your laptop has a user-serviceable battery — that is, one you can remove on your own — you can replace your battery fairly easily. Assuming you have a user-serviceable battery, you can order a replacement battery for your laptop model online.
There’s no point in obsessing over your battery’s capacity — it was designed to be used, after all — but it’s something to keep on eye on. Should you buy an OEM (original equipment manufacturer) battery, or a third-party aftermarket battery?
Oh, and before you spend your money on a new battery for your laptop, check to see if your battery is still under warranty, or if there are any recalls for it.
See my related article Extend Laptop Battery Life for more tips on squeezing extra run time from your battery. If your laptop spends most of the time plugged into an AC power outlet, here's what I recommend for lithium batteries. I've had a good experience with after market laptop battery supplier Laptopmate for my HP notebook.
Their batteries are guaranteed for one year from purchase date and their service and support are great.
I'd be interested to hear your take on the technique of using an external power supply, of slightly higher voltage than the laptop battery, to revive the battery's ability to take a charge. I noticed, when reading about the latest hybrid vehicles, that car manufacturers are not allowing the lithium-ion batteries now being used in some hybrids to go below a 30% charge as a way to extend the life of the batteries.
Some batteries, such as Sony's, have a proprietary chip in them that communicates with their computer for MORE than just the charge state. My desktop computer is getting very slow, and I have thought of replacing it with a laptop or notebook or whatever smalled units are available. I was intrigued by the paragraph re what to do when your laptop stays plugged into the AC most of the time.
EDITOR'S NOTE: I don't have any hard data to back that up, but it makes sense that a hot battery doing essentially nothing will degrade a certain amount.
I have an Acer Travelmate 244LC, bought second hand, probably around six or seven years old.Only used, once a week, for a couple of hours, for pp presentations. EDITOR'S NOTE: Even if the battery is dead, you should be able to run it on AC (wall plug) power.
I recently bought a new laptop (an Acer) running Windows 7 against my older laptop running XP and it spends most of its time on the desk permanently connected to the mains. My initial reaction to Bob's excellent information is the tips probably apply equally to power tool batteries as for laptop batteries. I am beginning to think that laptop batteries, like the machines they run, may have their own personalities. I never remove the battery for any reason, except to clean the contacts once or twice a year, summertime especially, because over time those little metal tabs can get a thin film on them. Heat and humidity have a way of destroying all electronics's, and to keep my PC from getting too hot, I use a double-fan cooling station to set my PC on - all the time.
Obviously my 2004 NC6220 is going to require a replacement battery at some time, which will force me to replace the computer.


Just wanted to say that one of the things I'm thankful for all year long is Ask Bob Rankin.
In 2006, Apple also recalled 1.8 million battery packs for iBook and PowerBook laptop computers due to overheating problems. When Armendariz decided to change his stage name, he took a lucha de apuesta (“betting match”) against an exotico called Johnny Vannessa: the loser would forfeit his name.
Long battery life and desktop-ready access to the web makes it more powerful than any tablet you can find, and it doesn't need no touchscreen. With a stunning 2,560-by-1,600-pixel display, excellent processing performance, and more than 11 hours of battery life, the MacBook Pro 13-inch with Retina display is about as premium a laptop as you can get. A practical guide to the maintenance and repair of laptop computers, including three hundred repair cases and thirteen diagnostic flowcharts.
Not only do some laptops offer poor time performance from a single charge, but you’ll also find that your battery gets less efficient over time.
Well, on that same support page, Apple has a list of their laptop models and each one’s theoretical maximum cycle count, which is the approximate number of cycles you can expect before you’ll need to replace the battery.
Ask Nick: Knowing when to replace laptop battery Online tools can help identify if a battery needs to be replaced or simply recalibrated. Windows will warn you when your battery reaches extremely low capacity levels, but you can also keep your own tabs on its capacity.
As you use it and it weakens, you’ll just notice that your laptop doesn’t seem to last as long on battery.
You’ll see a red X appear on the standard battery icon in your system tray and, when you click it, Windows will inform you that you should “consider replacing your battery.” Windows also says that your computer might shut down suddenly because there’s a problem with your battery — in other words, your battery can’t hold enough of a charge to power your laptop for long when it’s not connected to an outlet.
The battery didn’t actually gain any additional charge, but the calibration helped the battery’s sensor actually detect how much capacity was in the battery. If your laptop doesn’t have a user-serviceable battery, you’ll need to contact the laptop’s manufacturer so they can crack your laptop open and change its battery for you. Don’t just head to eBay and buy the cheapest third-party batteries available — buy official batteries from a reputable company.
If your capacity is dropping more quickly than you’d like, that may be a sign that you should be treating your battery better. There's a story floating around that freezing a NiCd or NiMH laptop battery overnight in a refrigerator freezer will restore its ability to absorb and hold a nearly full charge.
But if your battery is at the point where it will only hold a charge for a few minutes, it can't hurt to try it before buying a replacement laptop battery.
A recycled replacement laptop battery is one that has been salvaged from a discarded laptop. Old NiCad batteries needed to be "deep discharged" now and then to maintain their capacity. If a battery is repeatedly only partially recharged before being used, it may never again be able to hold a full charge.
It takes more battery power to spin a DVD disc drive than a hard drive, and a USB drive is more energy efficient than either.
Put any battery into a Vaio computer that's not an authentic Sony and you may just find, like I did, that the computer will not charge it. In the old days they had a switch that you could switch the battery out and run on AC on various electical equipment. I noticed that it appears to actively manage recharging the battery when on AC so it isn't constantly holding the battery at 100%. Transform your PC into a glitch-free, turbocharged, multimedia machine Want to add punch to your PC?
The course is designed for Cisco Networking Academy students who want to pursue careers in IT and learn how computers work, how to assemble computers, and how to safely and securely troubleshoot hardware and software issues. Recently I started getting warnings to the effect that I should replace the rechargeable battery. In other words, the laptop’s battery only holds 70.8% of its original capacity when fully charged.


Windows warned us that it was time to replace the battery and the battery appeared to be at 27.7% wear level according to its reported capacity. If Windows says it’s time to replace your battery, be sure to calibrate it first before checking its actual wear level. Batteries will slowly die no matter what — even if you put your battery in a closet and never touched it, it would slowly lose capacity due to age. Aftermarket batteries are often built on the cheap, with cut corners and insufficient testing. Perhaps you’re exposing it to too much heat if you leave your battery in while playing demanding, strenuous PC games on your laptop. It's important, say those who have tried this technique, to let a recently used and hot battery cool down to room temperature before putting it in the freezer in a sealed plastic bag. Note that this applies only to the older style NiCd or NiMh batteries, and NOT the newer lithium batteries. Rip your DVD discs to other media using free ripping software like Handbrake for Mac, Linux, or Windows. Thinking this was a bug of some kind, I did some research and found that this is NOT a bug. My HP laptop, usually used as a desktop, is nearly four years old, and the battery has been at 65% for about a year.
However, if you never use your battery — say you use your laptop at your desk most of the time and it gets rather hot, which is bad for the battery — removing the battery can certainly help prolong its life. They can be dangerous — a cheap, counterfeit, and improperly designed battery could literally go up in flames.
It is equally critical, they say, to let the battery thaw and warm up to room temperature fully before attempting to charge or use it again. Lithium batteries can actually be damaged by freezing, so don't leave your laptop in a cold car overnight. If it supplies the right voltage and current to your laptop, any maker's laptop battery should be satisfactory. A refurbished replacement laptop battery has been taken apart, had its chemical cells replaced with new ones, and restored to OEM specifications. This is not very useful, but still pretty good for ancient batteries that probably had been abused by their previous owners. I don't know if that is a Windows 7 feature or an Acer feature but I wonder if that is designed to reduce degradation when on AC most of the time.
Easy steps show you how to add memory, update your virus protection, get your PC ready for Windows Vista or rev it up as a cool entertainment center capable of recording TV shows or hearing DVDs in surround sound. High Quality laptop battery replacements for Acer, Apple, Asus, Compaq, Dell, HP, Lenovo, Sony, Toshiba notebooks. After fully charging, run your laptop until the battery is drained, then repeat this cycle a few times for maximum effectiveness.
But there are unscrupulous aftermarket manufacturers who sell batteries that tend to leak, don't take a full charge, or don't last as long as they should. Some refurbished batteries even last longer than OEM batteries of older model laptops, because their chemical cells are of newer technology that holds more charge. Aftermarket batteries are an unknown gamble but much cheaper, often half the cost of OEM batteries. Unfortunately, you can't tell a recycled battery from a refurbished one by sight; so again, check the maker's reputation with a Google search before buying.
Research an aftermarket brand carefully to see what customers have to say about its longevity, performance, and the vendor's service. No thank you.) 3) Pull the new cells out of an alien battery pack (or purchase loose cells) and install them into the old Sony battery case containing their proprietary chip.



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