I don't have the high power requirement of a Carpenter bike.
Unless you have some existing problems with the current battery life or big power draw, a single battery should suffice.
As for batteries, the Yuasa HP ytx-20 is perfect for MY Rocket. You can buy three for the price of most single LI ION batts.
I have all of the draw accessories (dual temp heated corbin seat and triumph grips and triumph AUX lights and GPS and three aux power outlets -USB and Cig lighter-type),
There is plenty of power for the standard Rocket.
Upgrade the cables!
Put in a battery tender and tap it when you park. this alone should give your NON Lithium battery life for years.
The battery thread covers everything. it will be back. give admin a couple of days.
I have a converted word file for the headlight and starter relay and ground cable upgrade if you can't get it back form the site.
