Details on running constant IMA on a Honda Insight?

Em Diggity questioned:

I found the following on Wikipedia discussion about being paid a larger battery for a Honda Insight and then life able to run the gripping motor constantly, charitable you highway mileage over 100mpg.

Honda hybrids like the Insight are Analogous Hybrids which at first glance would not seem to benefit much from a plug-in hybrid conversion as they do not have an EV-mode like the Toyota Prius. But by using a better battery the 10 kW (13 hp) IMA may maybe be run in a continuous help mode to succeed gas consumption and push the mileage well into the one-hundreds on the freeway. The Insight is a very set alight and polished vehicle which makes it very striking for conversion.

Does anyone know anything about this? How much would a conversion such as this cost?