Unlike an engine starting system, as on a KLR650, requiring short-duration high amperage, a weed eater, blower, or maybe even a golf cart (an electric one) uses much lower current, but over a longer period of time.
I can't vouch for the letter in MCN Magazine posted above, but--the nature of electric power requirements is different for different applications. The cold cranking amps are important for the initial and brief demand of an engine's starter motor, not so much to other electric motors operating a lower continuous current levels.
The prospect of a lithium battery for a KLR650 has intrigued me; would like to try one (or for someone to try one) and see how it goes. Of interest: How do lithium and lead-acid batteries compare with respect to powering heated clothing?