I have got a copy of the system in a CF card, and from time to time i managed to boot the 5300 from a PCMCIA adapter (not quicker but silent) and to save weight i removed the leaking batteries from their casing when i collected the first 5300 (the final result are the two pictures above) the empty case keeping the design of the PWB.
At some point Apple did the same IIRC.
I don't need a working battery anyway.