Yeah, it could well be that. Although as the last of the 100 series it is not overly electronified. Hell, it has a tape deck. (And a CD/DVD* changer, whose input is now taken over by an aftermarket USB input that shouldn't have parasitic drain in and of itself.)So one thing that could be happening is drain from all the electronic crap that contemporary cars leave running when they're "off", which could say that your battery is in fact fine.
* when in Park one could in theory play a movie on the DVD changer on that craptastic 640 x 480ish resistive touchscreen
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