can new batteries be installed in the keyfob?

Hello, yes - the key fob takes batteries. Honestly, I find the best thing to do is to take it to your local dealership parts department. Most all I know of will swap the batteries for you for just the price of a battery. I've seen folks take them apart yourself -- and you can -- but I've also seen people damage them accidentally. Could get expensive! For my money, I just let the parts folks handle it.