I've been using the old lead acid battery that came with the bike of unknown age or condition. The bike would start, but it was slow to turn over and seemed really weak. Even fresh off the trickle charger it would really struggle. I just got my new Motobatt AGM installed and holy shit! It's 40 something degrees out, it's got FCRs so no choke, and fired immediately. Couldn't believe, was expecting to spend 5 minutes fiddling with it until it stayed running.