Yes, car remote operate on batteries either these are with key fobs or remotes. There are different types of car remote batteries but usually, 10 types of batteries are used. The most common types of batteries are CR2025 and CR2032 3-Volt. It is true that you don’t need the car remote battery to open the car but you need it to operate any remote function or keyless entry function.
How to replace the car remote battery?
You need to replace your car remote batteries and changing the remote or fob battery is quite easy. You can replace the it by yourself at home. Opening the remote will require a micro screwdriver to open up any screws from the bottom part. Once you open it, look for the battery number that is usually written on it and buy a similar one.
You need to be careful about the placement of the battery as which side face down +ive or -ive. Now replace the battery and gently snap the key fob together. Check whether the remote is working or not and then screw it up again.