Getting access to the Reva G-Wiz battery
Channel: Turbo Electric
Date: 15/06/2015

http://www.turbo-electric.info/revagwizresearch.html

Also check out https://www.youtube.com/playlist?list=PL7jE0nN6sq2Y3vmAK_7O1sb2SMwirJ7IX which has all the details including details of changing the battery yourself