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Replace the device's battery (buy a new battery)
Batteries don't last forever and their capacity becomes lower as time goes by. Batteries are designed to last for a period of 2 years minimum. However, some batteries don't last that long.
If you have charged your laptop or your mobile device and you cannot use it more than 20 minutes (even an hour), it is a good sign that you need to replace the battery.
As a resolution to the "battery draining quickly" problem, write down the model number of the laptop, or the other (mobile) device's, which is located on a label on the outside of the notebook , or under the battery of your (mobile) device. Then, go to a store, tell them the model number and they will give you the suitable battery.
After you place it in your device, make sure to drain it first (play games, browse the net and other activities), and then charge it for at least 12 hours (the first three times). After that, you can charge it whenever you want.
Note: Buy ORIGINAL batteries only. They are a bit more expensive than the fake ones, but they won't harm your (mobile) device. Unfortunately, nobody can recognise what is original and what is not, and that is why the safest place to buy a new battery is an authorised store.
If you have recently bought a new battery and you have the "battery draining quickly" issue, a factory defect might be the problem.
Every item you buy is under warranty for a period of at least a month (some items more than a month), and if the battery is not working properly within the warranty period, go to the store where you bought it from, enclose the receipt you received on the purchase date along with the warranty ticket, and ask for a replacement.
Turn down the screen brightness (Dim the display)
The higher the brightness level is, the faster the battery drains. This means that if you dim the display you will prolong the battery's duration, and minimize the effects of the "battery draining quickly" issue. Every OS (operating system) offers manual adjustment of brightness level and it can be done in a pretty easy way.
End background processes and services (Windows)
Background system processes can do more than just slow your computer down, they can be the reason for the battery draining quickly issue. Close any background applications you don't need to be running while you are on battery power, and disable automatic updates, scheduled tasks, search indexing etc.
A laptop battery cannot last forever. As time goes by, laptop batteries lose their ability to charge and in the end they die (cannot be charged at all).
A laptop battery is designed to last for at least two years, if used properly. However, if you use your laptop in a hot environment and it overheats all the time, the cooling fan will be working all the time. As a result, your battery will become weaker and it will die faster.
To prevent this, buy a cooling pad, place your laptop on it and connect it to the laptop's USB port so that the cooling fan can work. If you use a cooling pad all the time the laptop won't overheat and your battery will last longer.
Prevent scheduled tasks from running when you use battery power
Your virus scanner and disk defragmenter and automatic updates, are scheduled to run themselves on a regular basis, often without your knowledge or permission and they consume power. This is the main reason why it is recommended that you allow scheduled tasks running only when your laptop is connected to an AC adapter.
To modify the scheduled tasks:
Control Panel -> (System and Security) -> Administrative Tools -> Task Scheduler ->
-> Select Task Scheduler (Local) in the left window pane -> Select every active task that has a future date in the Next Run Time column and do the following:
Double-click the task.
Select the Conditions tab.
Check the first two power options: Start the task only if the computer is on AC power and Stop if the computer switches to battery power if they are not already checked.
Click the back button (upper left side of the window) to return to the list of active tasks and repeat the procedure.
After some time (usually a year) the air vents of your laptop get clogged by dirt which prevents the circulation of air, thus increasing the temperature of the laptop itself (and its components: CPU, RAM and etc.). As a result, the cooling fan will be spinning all the time and it will drain the battery faster.
Clean the air vents regularly (once per year) to keep operating temperatures low. Allow for open space around the vents for air to circulate freely.
Most of the recent Android smartphones, like the Galaxy S6, Nexus 6 and HTC One M9 and others, have battery saving modes that can extend the life of your device, even if you’re already under 20%. Battery saver performs various operations with one goal, to save energy. It does that by limiting vibrations, location services and background data.
To enable it go to Settings -> Battery saver (Power management) -> Find power saving mode (enable the slider)
iOS also offers a setting called Low power mode which is an easy way to extend the battery life of your mobile device when it starts to get low.
To enable it, go to Settings -> Battery -> Tap to enable the Low power mode