Source:https://www.behance.net/gallery/124216777/How-to-change-the-Battery...
Key fob is a device that is with the car key, which many cars do not have, so it is not necessary that all cars have this key. It also has lock, unlock and boot buttons.
With the help of which the trunk and tailgate of the car can be opened and closed.Which works with the help of a small battery. This battery works within 2 to 4 years or more.Due to the depleted power of the battery, the battery has to be changed.There is also a Battery in a Key fob Battery Low indicator in the vehicle's meter, you can find out from here also.
If you want to buy in the market or online whose Price is 1 $ to 3$ in Dollar and Rs.80 to 250 INR.
In simple language, the battery has to be changed.

Simple 5 steps to change the Battery in a Key fob-

Find marks to open.

First of all, open and you have to find or mark all around because not all have marks. To find the mark, the key will be in between the two parts of the fab. It is a bit difficult to find but not impossible

Use any kind of tool to open.

To open, any kind of screwdriver or tool has to be used. If you do not have tools then you can buy from the market because without tools it cannot be opened, remember it will be difficult to open it, after opening, keep both the parts separate. It may break while opening, so be careful.

Find where is the battery in the key fob?

Now you have to find where is the battery from both the parts, the battery can be in any part. Keep in mind that the battery has to be removed very carefully, because any part can be damaged while draining the battery.
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Replace the Battery.

Now, before changing the battery, check that the size of the old battery and the new battery is equal, if the battery size is different then it will not fit and you will have to replace the battery.
carefully removing the old battery, unpacking the new battery, You have to unpack the new battery at the same time, because the unpacked battery can get spoiled long ago.
and replacing the old battery with a new one. Keep in mind that check the battery directly on the opposite side.

Close the Key fob.

After that, the way was opened, you have to close it in the same way, and press it hard. While closing the key fob, keep in mind that should be closed properly, because if not closed then it may not work.

Congratulations! Your Key fob is ready to use.

If you do not want to change the battery or there is any problem in changing the battery, then you can also take a new key fob, it is easily available in the offline and online market.
Changing the this is also not bad. You can.