I'm very sorry to hear of your problems. I hope you hang in there, until someone sees the light . A couple of thoughts:

Find the upper levels of customer relations, and complain there. Keep on escalating. Write to Japan if need be. Polite and factual is best.

Write to CARB. Honda are not honoring the warranty.

Demand arbitration wrt your warranty. I know arbitration is not fair, but this is so left-field you should win anyway.

Demand from Honda a written explanation of criteria that they will consider battery failure. Have them explain why your situation does not satisfy them.

Have you had your error codes examined ? If nothing is popping up, the diagnostics that monitor the battery are simply inadequate, and should not be relied upon to document failure.

Make sure you have written documentation from a Honda certified mechanic regarding the battery. Include it with every letter you send.

Since you posted here, I presume you are posting at every Honda hybrid site known to man ? Good.

Check out planetFeedback. I don't know if they have direct lines to Honda, but if they do place a complaint there as well.

If all this fails, I would seriously consider writing letters to the editor to the major car magazines. This is truly unconscionable conduct, and if Honda has made this policy, consumers should know about it.

Very saddening state of affairs.

R2-E2, 2G Prius.
Highway/City/Husband/Wife MPG: 56.5, as of 12/2005, 26K miles

Jac Nasser, Ford President: "We are planning to launch a hybrid version of
this car [P2000] within this year [1998]. We will also make FCEV available in
2004."