haven't received it yet.jimbo, I bought my Alton for my 850 from Classic Bike Experience and the instructions came with specific battery purchasing instructions
I remember buying an Odyssey, your Alton purchase did not come with battery specs? I can look it up later if someone does not chime in
I have a DEKA battery in my 73 850 with an Alton starter. It works great. I think it is a 20EXL (?). Check on their website.haven't received it yet.
I previously posted about the Yuasa battery reccomended by Alton. I have just measured the battery tray and it appears that nothing bigger than 87mm wide and 155 long will fit. The measurements shown for the Yuasa are 87 wide, and 175 long, height 155.
Can anyone with first hand experience offer any light on this please as I will shortly be fitting an Alton starter and would like a battery that fits and doesn't break the bank! 850 mk11as by the way. Am looking up the DEKA.