Alright, what's the smallest/ best battery out there?

[Telecasterjoey]

I've done a lot of research regarding batteries but I still have no idea what one to get!
I'm building a cafe style 82' 400 heritage special I'm in the fabrication stage and I need to know what size of batt ill be putting in it. Curious if you guys have good expirience with any particular brands or suppliers.

This bike will be kick only!

Thanks in advance

 

[drewpy]

I ended up with an alarm battery of 3.2amp capacity, just need to watch the charge rate doesn't get too high or it can kill it!