Kubota W5021 walk behind self propelled SCE electric start

Hi

I'm a new member Would anyone know what battery will replace the original Kubota battery on my W5021SCE its an LCS2912K 12V 2.9ah with a wire lead. size is L 4 inch W 2 1/4 H 3.0 I have two Kubota's one is an W5021SC 35 years old and built like tanks



Thanks

Gene