The Honda Accord remote key does have a battery.
YES!
what is the replacement battery for a 2003 Honda accord key fob
with a key
In order to disarm a Honda Accord alarm, first you need to put the key in the driver's side lock. Then you need to twist it quickly from left to right.
ligh key in the panel
with the key
A jewelers Phillips screwdriver. Take the key fob to any Walmart and go to the jewelry dept. They will have a screwdriver that will work and they will have the replacement battery. Just did this myself on my 2004 Accord key.
No.
Yes.
you get a key
You can if the key has a door lock/unlock button. I lock mine all the time with the remote. If you have the button on the key and it is not working then maybe the battery in the remote is dead? Open it up and replace the battery.