I am using CR2032 and i bought it from F-10 for RS 500 but i hardly worked for 3 to 4 weeks. Then replaced it again and it worked for only a week.
I tried to open the FOB and cleaned it fully. The low battery sign has gone and since last two days it is working without any error.
Let's see if it keep working or again it gets drained.
Thank you for kind support dear.