I recently "inherited" a car which has been unused for the last two years.
I charged the battery, however the starter motor only makes some ticking noises, it doesn't actually turn over.
Then, a mate donated a battery that has been sititng ni his garage for a couple of years. Same story with that one too.
Oddly enough, it starts fine when jumped off the other car.

The question: are both batteries likely to be knackered, or could it be the car ??
(footnote: I would try it with the battery out the other car if I knew what the code for the radio was!)