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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.
It is possible that the battery drains quickly because there isn't a good power transfer between the laptop (or the mobile device) and the battery.
That is why it is recommended to remove the battery and clean the metal contacts (they are the "bridge" between the laptop and the battery cells) with alcohol, once in every two months, to ensure maximum power transfer.
Make sure to allow the battery to dry thoroughly before you reinsert it again.