How do I remove the battery from a Hayter 10/30 ride on?

How do I remove the battery from a Hayter 10/30 ride on? It doesn't appear to fit through the hatch that covers the engine and I can't see an access panel from the back. Do I have to dismantle the mower or engine to remove the battery as it is knackered.
Phil, March 2015
I was struggling till I watched this - https://www.youtube.com/watch?v=HZL6gN1Y0Qw
Easy

Howard, July 2019
link Click here to see other fixes for Hayter.