I got a 6 volt from Lincon for the WC54. Just phoned them told what I wanted it for, and they told me the specs. I was not dissapointed the battery has been very reliable. The Oddsey, I got mine from Gigglepin 4x4, but you can get them online from the company
http://www.lincon.co.uk/
http://www.odysseybattery.com/