Join Date: Jan 2007
Location: San Diego, Ca, USA
I have not had good luck with the OEM battery in my GTs. The one in my 07 lasted just over two years and likewise for my current 08. The bikes are ridden quite often, but they never sit for more than a week (I go into a slight funk). The only indication of a weak battery is slow cranking. I will not wait for this to happen again.
My next choice will be the Shorai Li Fe PO. I have inquired about the "low temp" issues and Shorai rep indicated that once the ignition is on for a minute or two, it will warm due to current flow and start handily. Of course So. Cal is not subject to much of this, but where I travel it often gets into the 20s. We will see next winter.
Good luck on your decision.