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I own a Samsung Series 5 Ultrabook which I bought in 2013. At the time, it had reasonably good battery life; I got around six hours of mixed use out of it, which was adequate for dashing off to a few out-of-office meetings in a row without having to bother lugging the charger along.

Fast forward a few years, and my laptop’s battery now lasts around two and a half hours, at best. This is normal as, over time, laptop batteries, like mobile phone batteries, lose their ability to hold a charge. This means that even though the battery is charged to 100 percent, it actually holds less power than when it was new.HP Probook 4430s Battery
I now travel a lot and my laptop’s limited battery life is becoming an issue. But just how much capacity has my laptop’s battery lost, and is it really necessary/worth my while to replace it?

Windows 7 will actually tell you when your laptop battery is no longer holding a full charge. Once your battery gets down to 40 percent of its original capacity (it can only hold 40 percent or less of what the manufacturer specified as the 100 percent capacity when the battery was new), Windows will display a notification that says “Consider replacing your battery.” I’ve been unable to confirm if this feature was carried over to Windows 8 or Windows 10.Compaq Presario R3000 Battery

If, like me, you’d rather not wait for the Windows-generated notification, you can generate a battery report following a few easy steps.
How to generate a battery report in Windows
Launch Command Prompt by right-clicking in the bottom left-hand corner of the screen and selecting “Command Prompt” OR press Win+R on your keyboard to open the Run Window and type cmd or cmd.exe. If you’re on Windows 10, the easiest way to do this is to press Win+X and selecting “Command Prompt” from the pop up menu.Dell XPS M1730 バッテリー

In the Command Prompt, type powercfg /batteryreport and press Enter. The window will display a message saying “Battery life report saved to…” with the file path to the destination.

Open the Users folder (typically the location Windows will save the battery report to) and double-click the Battery Report file to open it in your default browser.

The battery report contains quite a bit of information, including battery life estimates, battery capacity history, usage history, recent use for the last three charge cycles, and more.

What we’re trying to find out is what our laptop’s full charge capacity is now, versus what its capacity was when it was brand new. For that, you need to look at Full Charge Capacity vs. Design Capacity under the Installed Batteries section.Dell Inspiron 6000 バッテリー

Battery Report

For my laptop, the battery’s Design Capacity is 45,140 mWh and the current Full Charge Capacity is 28,860 mWh, or just over 63 percent of its original capacity — not too bad for a three-year-old battery.

At around $97 for a new battery, I may consider getting a new battery fitted in the coming months as my laptop is still adequate for my needs and the cost of replacing it with a similarly-spec’d or slightly upgraded device is eight- or nine times the cost of a new battery.

Depending on the results for your battery, you may want to consider having it replaced at a manufacturer service center or other reputed repairer. For the best gains in battery life, make sure you get a new battery made by the same manufacturer as your original battery and check that it comes with at least a one year warranty.Akku Dell latitude d820
If you've tried all the tricks -- dimming your screen, closing apps and turning off unused antennae -- but your laptop's battery still can't hold a charge, it might be time to replace the battery.
A battery's capacity (the amount of energy it can hold) depletes over time. Eventually, your once high-endurance laptop might only last a couple hours. Same goes for phones and tablets.
On Windows, the best way to find out if it's time to replace your battery is to generate a battery report.
How to generate a battery report in Windows

Launch the Command Prompt by right-clicking the lower-left corner of the screen and selecting "Command Prompt."

In the Command Prompt, type powercfg /batteryreport and hit enter. You'll see a message letting you know a file was saved.

Head to your Users folder to find that Battery Report file and double-click to open it in a browser.Akku DELL Vostro 3550
There's a lot to learn from the battery report, like your battery's capacity history (how it's depleted over time) and analysis for the last three charge cycles. But for our purposes, the most important metric is Design Capacity versus Full Charge Capacity.
Design Capacity is how much power your laptop could hold when you unboxed it. Full Charge Capacity is how much it can hold now. For instance, my laptop's Design Capacity is 46,030 mWh while the Full Charge Capacity is now 39,030 mWh.
For me, the depletion is still tolerable. But if your Full Charge Capacity is drastically lower than the Design Capacity, you might want to find out if it's possible to replace the battery.
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