That transceiver has a CR2016 3V lithium cell on the main board, it
needs to be replaced.
Go to: "http://www.rigpix.com/yaesu/ft2400.htm" , and download the
schematic, it's right below the reset jumper.

Bob N9LVU


Pascal Montaigne wrote:
My ft2400 loose it's config during power failure. I am planning to
replace it's battery but I can't find it.

Can someone help me?

73, Pascal, f5poe