The two key fobs to our car died a long time ago and we have just used the key ever since. Last week I decided to do something about that. The battery type is listed right on the back of the fob (CR2032).
I searched online and saw one forum saying that Dollar Tree had 3 for a $1. Naturally, I tried there first, but our local dollar tree doesn’t carry button cell batteries. I did find a set of two at Wally World for $4, a price that beat Walgreen’s 1 for $5.
With the replacement battery procured, I had to figure out how to open the fob. There was a very small indentation at the 5 o’clock position that a flat head screwdriver could fit into.
With the fob opened up, it was a simple matter to replace the old battery and close up the fob again.
Prices for new fobs for our car range from $12 (Amazon) all the way to $100 (stealership).