[geekmaster]

I think I saw in some system scripts (at least on some models) that there is a flag file you can drop in the file system (perhaps at root rather than userstore) that bypasses battery check.

Editting your scripts will work, but may interfere with a firmware update (depending on firmware update integrity checks). Some updates throw an error if they detect "hacks" (modified files). But if not a concern, then your suggestion is a good (easy) way to do this.

However, if you disassemble a dead battery, you can use the little circuit board inside it between the kindle and the power supply, and the kindle should "see" an official amazon battery (though I have yet to try that myself). Not sure how confused the kindle battery charging algorithm would get with an infinite capacity battery (i.e. external power supply masquerading as a battery).