Where can I find a Capcom CPS2 motherboard backup battery?

For those who purchase authentic arcade game motherboards, finding backup battery hardware isn't always a simple affair.  ID'ing the battery, much less locating it can be a challenge.

For those who own a Capcom CP System II (CPS2) game motherboard, you'll want to purchase this model battery to replace your old one.

XENO XL-050FAX 3.6V LITHIUM BATTERY LS14250 1/2AA AXIAL LEAD

You can find this at www.bestbyte.net

Thanks to SRK's DEZALB for the suggestion.