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Add up all of the wattage you'll be using and divide by 12. Headlight and taillight plus any indicators and the ignition system...I'm thinking a minimum of 7amp-hours or so. The less stuff you light up the smaller you can go.

Or, did you mean dimensions instead? Those newish Shorai batteries are pretty small but I think they use a dedicated charger and maybe tht'sa deal breaker..



The Shorai Lithium Iron battery is smaller in size, and has about 50% more power than the OEM battery. It does not require a dedicated charger. If you use an external charger it cannot have a desulfation mode, and it needs to have a float level mode. They do make their own charger, but the Battery Tender has been deemed OK by the manufacturer.

Here is some info on the Shorai Lithium Iron battery.

Last edited by tcv; 06/17/2013 1:54 PM.
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