This is a bit of a work in progress, but I’ve found a 10000mAh powerbank that fits inside the empty battery pack.
Amazon Link
With the relevant PD breakout board it could provide 12V either for my custom LCD replacement (see other post) or perhaps power the whole laptop?
Amazon Link
With the relevant PD breakout board it could provide 12V either for my custom LCD replacement (see other post) or perhaps power the whole laptop?